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Loss of fluid flow through friction
In fluid dynamics, friction loss (or frictional loss) is the head loss that occurs in a containment such as a pipe or duct due to the effect of the fluid's
Friction_loss
Equation in fluid dynamics
dimensionless friction factor, known as the Darcy friction factor. This is also variously called the Darcy–Weisbach friction factor, friction factor, resistance
Darcy–Weisbach_equation
Equations for calculations of the Darcy friction factor
description of friction losses in pipe flow as well as open-channel flow. The Darcy friction factor is also known as the Darcy–Weisbach friction factor, resistance
Darcy friction factor formulae
Darcy_friction_factor_formulae
Force resisting sliding motion
types of friction can be wear, which may lead to performance degradation or damage to components. It is known that frictional energy losses account for
Friction
Ratio between local shear stress and bulk dynamic pressure within a flow
The Fanning friction factor (named after American engineer John T. Fanning) is a dimensionless number used as a local parameter in continuum mechanics
Fanning_friction_factor
Fanning friction factor After both minor losses and friction losses have been calculated, these values can be summed to find the total head loss. Equation
Minor_losses_in_pipe_flow
Graph used in fluid dynamics
Journal of the Institution of Civil Engineers. 11 (4). London, England: 133–156. doi:10.1680/ijoti.1939.13150. Friction loss Darcy friction factor formulae
Moody_chart
Term used in fluid dynamics
equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe. TDH is essential for pump specification. T D H = Δ z +
Total_dynamic_head
Material which is solid at low stress but becomes viscous at high stress
{\displaystyle f} is the Darcy friction factor (SI units: dimensionless) h f {\displaystyle h_{\text{f}}} is the frictional head loss (SI units: m) g {\displaystyle
Bingham_plastic
Mechanical device that changes the direction or magnitude of a force
single applied force to do work against a single load force. Ignoring friction losses, the work done on the load is equal to the work done by the applied
Simple_machine
System of two or more pulleys and a rope or cable
pulling line to a potentially more ergonomic direction, which increases friction losses without improving the velocity ratio. Situations in which reeving to
Block_and_tackle
turbine casing Leakage of steam through these gaps is a direct loss of energy. Frictional resistance is offered during the flow of steam through nozzles
Energy losses in steam turbines
Energy_losses_in_steam_turbines
Cost advantages obtained via scale of operation
economies of scale, such as capital cost of manufacturing facilities and friction loss of transportation and industrial equipment, have a physical or engineering
Economies_of_scale
Quantity in a hydraulic circuit
{p_{v}}{\rho g}}-(z_{e}-z_{0})+h_{f}} Note that, in turbines minor friction losses ( h f {\displaystyle h_{f}} ) alleviate the effect of cavitation -
Net_positive_suction_head
Gravitational loss of momentum and energy by bodies moving through surrounding matter
In astrophysics, dynamical friction or Chandrasekhar friction, sometimes called gravitational drag, is loss of momentum and kinetic energy of moving bodies
Dynamical_friction
Force opposing the flow of fluid through pipes
through pipes. Obstructions or tight bends create backpressure via friction loss and pressure drop. In distributed systems in particular event-driven
Back_pressure
Tradesperson specializing in water and sewage systems
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Plumber
Flow-control device
hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted but the valve is larger and more expensive so
Ball_valve
Ratio of inertial to viscous forces acting on a liquid
157–165. Sinnott, Coulson & Richardson 2005, p. 73. "Major Head Loss - Friction Loss". Nuclear Power. Retrieved 17 September 2019. "Laminar, transitional
Reynolds_number
Systems for conveying fluids
same applies to pipe schedules. As a result, a slight increase in pressure losses is realized due to a decrease in flowpath as wall thickness is increased
Plumbing
HVAC noise control treatment
n L o s s = P A l ( K f 1 2 ρ v p 2 ) , N / m 2 {\displaystyle Friction\ Loss={\frac {P}{A}}l(K_{f}{\frac {1}{2}}\rho v_{p}^{2}),\ N/m^{2}} where:
Sound_attenuator
Model that is used to predict the performance of steam turbine systems
completing the cycle. Friction losses throughout the system are often neglected for the purpose of simplifying calculations as such losses are usually much
Rankine_cycle
Unit of power
account power losses due to the machinery internal frictional losses, such as a piston sliding within the cylinder, plus bearing friction, transmission
Horsepower
Retarding forces within an engine used to slow a vehicle
certain amount of engine braking (viscous losses to the engine oil and air pumped through the engine and friction losses to the cylinder walls and bearings)
Engine_braking
Lubricant additive to reduce friction and wear
Friction modifiers are added to lubricants in order to reduce friction and wear in machine components. They are particularly important in the boundary
Friction_modifier
Tool to dislodge clogs in plumbing
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Plumber's_snake
Gases produced and collected in sewer systems
in the lungs. Prolonged low-level exposure may cause fatigue, pneumonia, loss of appetite, headaches, irritability, poor memory, and dizziness. High concentrations
Sewer_gas
Bowl-shaped plumbing fixture
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Sink
Waterproof receptacle for holding liquids, usually water
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Cistern
Unwanted reverse flow of water
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Backflow
Bathroom plumbing fixture
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Bidet
Wrench for assembling and disassembling piping made of threaded pipes
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Pipe_wrench
Tarred fiber
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Oakum
Combustion that leads on to an explosion
transitions (DDTs): Predicting DDTs in hydrocarbon explosions". Journal of Loss Prevention in the Process Industries. 30: 263–274. Bibcode:2014JLPPI..30
Deflagration
Dermatological condition
Frictional alopecia is the loss of hair that is caused by rubbing of the hair, follicles, or skin around the follicle. The most typical example of this
Frictional_alopecia
Energy loss in heat storage systems
Standing loss, or standing losses, is a non-technical term to define energy losses in a system, usually associated with heat and hot water storage systems
Standing_loss
Method of fluid escaping containment
and therefore undesired. The word leak usually refers to a gradual loss; a sudden loss is usually called a spill. The matter leaking in or out can be gas
Leak
Type of diesel engine
model equipped with anti backlash gearing suffers a friction loss. The gears must overcome more friction throughout their moving range than a standard gear
Cummins_X-series_engine
Part of an internal combustion engine
The advantages of timing belts are typically a lower cost, reduced friction losses,[citation needed] less noise and that belts traditionally do not require
Timing_belt_(camshaft)
Part of a reciprocating engine
wall causes friction losses for the engine. The friction caused by piston rings is approximately 24% of the total mechanical friction losses for the engine
Piston_ring
Tool to clear blockages in drains and pipes
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Plunger
Work done divided by heat provided
delivered at the clutch or at the driveshaft. This means the friction and other losses are subtracted from the work done by thermodynamic expansion.
Engine_efficiency
Water that has been used and contaminated
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Wastewater
Practical uses for Stirling engine technology
can be built, which can be completely hermetically sealed, reducing friction losses and completely eliminating refrigerant leakage. For example, a free-piston
Applications of the Stirling engine
Applications_of_the_Stirling_engine
Medical condition
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Scalding
Vessel or conduit for unwanted water or waste liquids to be flumed away
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Drain_(plumbing)
Thermodynamic device that uses energy to raise the temperature of water
years. Instant water heaters provide hot water as you need, with less heat losses and often at a cheaper price than storage water heaters. Storage heaters
Storage_water_heater
Reciprocating internal combustion engine
introduction of FB16DIT in 2014. Subaru claims a 28-percent reduction in friction losses, mainly due to the addition of roller rockers in between the cam and
Subaru_FB_engine
Tradesman who works with mechanical pipes
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Pipefitter
mid-depth of the anchor component. anchor friction The loss of prestressing force in the tendons due to friction generated by the strands sliding against
Glossary of prestressed concrete terms
Glossary_of_prestressed_concrete_terms
Plumbing device
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Trap_(plumbing)
Flow control device
construct than other types of valves in large sizes. At high pressures, friction can become a problem. As the gate is pushed against its guiding rail by
Gate_valve
Technology of Petroleum (4th ed.). CRC Press. p. 40. ISBN 978-0-8493-9067-8. Pipe fitting friction calculation Pipe Friction Loss Calculations v t e v t e
K_factor_(crude_oil_refining)
Toilet by the Japanese company Toto
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Washlet
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
List_of_tools_and_equipment
Type of pump
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Sump_pump
Common material used as sealant or filler
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Putty
Force resisting the motion when a body rolls on a surface
called slip loss or slip resistance. In addition, only the so-called slip resistance involves friction, therefore the name "rolling friction" is to an extent
Rolling_resistance
Infrastructure that conveys sewage or surface runoff using sewers
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Sewerage
Bicycles without a straight chainline are slightly less efficient due to frictional losses incurred by running the chain at an angle between the front chainring
Chainline
Lowest temperature at which a fuel will burn continuously
Flammability diagram Flammability limit Flammable liquid Flashover Flash point Friction loss Gas leak Heat transfer Jet fire K-factor (fire protection) Pool fire
Fire_point
Medical condition
Iliocostal friction syndrome, also known as costoiliac impingement syndrome, is a condition in which the costal margin comes in contact with the iliac
Iliocostal_friction_syndrome
1894 essay by German engineer Rudolf Diesel
less friction, which would allow an engine having a higher total efficiency, than an engine with a greater thermal efficiency but more friction losses: The
Theory and Construction of a Rational Heat Motor
Theory_and_Construction_of_a_Rational_Heat_Motor
Underground pipe for transporting sewage
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Sanitary_sewer
Safety valve used to control or limit the pressure in a system
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Relief_valve
Large container for holding water in which a person may bathe
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Bathtub
Container for storing water
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Water_tank
Angled pipe fitting
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Street_elbow
Object used to close a drainage outlet
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Plug_(sanitation)
Device that shreds food waste for disposal via plumbing
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Garbage_disposal_unit
Fitting used in plumbing and piping
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Nipple_(plumbing)
Flow control device
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Globe_valve
Place in which a person bathes under a spray of water
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Shower
Room where clothes are washed
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Laundry_room
Exhaust-powered forced-induction device for engines
(compressor discharge) and improving wastegate response Reducing bearing frictional losses, e.g., using a foil bearing rather than a conventional oil bearing
Turbocharger
Combustion engine using disks compressing fuel in the same cylinder
and valve-train, which reduces weight, complexity, cost, heat loss, and friction loss of the engine. Creating a uniflow-scavenged movement of gas through
Opposed-piston_engine
Water tower on the roof of a tall building
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Rooftop_water_tower
Flexible tube used to convey water
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Garden_hose
Measure of an engine's capacity to do work
acting on a piston during the different portions of its cycle. When friction losses are subtracted from the IMEP, the result is the brake mean effective
Mean_effective_pressure
Reciprocating internal combustion engine
mileage over 23km/L, achieved maximum power on lower rev and reduced frictional losses. CNG variant also available for Indian domestic market. Technical
Suzuki_K_engine
Type of spring shaped like a washer
safety must be increased in order to compensate for loss of load due to friction. Friction loss is not as much of an issue in series stacks. In a series
Belleville_washer
in contact with a set of rollers which can be adjusted to simulate friction losses and aerodynamic resistance. The motorcycle is then accelerated and
World_Motorcycle_Test_Cycle
Device that prevents undesired water flow
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Backflow_prevention_device
Flow control device
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Diaphragm_valve
Loss of hair from the head or body
to become weak and break off, reducing overall hair volume. Frictional alopecia is hair loss caused by rubbing of the hair or follicles, most infamously
Hair_loss
Rapid ignition of combustible material in an enclosed area
Station Nightclub fire in West Warwick, Rhode Island, which resulted in the loss of 100 lives, flashover conditions occurred approximately 90 seconds after
Flashover
American standardization organization
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
National Sanitation Foundation
National_Sanitation_Foundation
Vertical space between water outlet and flood level
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Air_gap_(plumbing)
Characteristic of rocket engine nozzles
two-phase flow loss efficiency. η f {\displaystyle \eta _{f}} is the skin friction loss efficiency (typically about 0.99). Source: η d = ( 1 + c o s α 2 ) {\displaystyle
Thrust_coefficient
Provides water at nearly constant temperature
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Pressure-balanced_valve
Valve controlling the release of a liquid or gas
washers. These taps exploit the uniquely low value of the coefficient of friction of 2 ceramic surfaces in contact, especially in the presence of water as
Tap_(valve)
Pressure surge when a fluid is forced to stop or change direction suddenly
density, B is the equivalent bulk modulus, and f is the Darcy–Weisbach friction factor. Column separation is a phenomenon that can occur during a water-hammer
Hydraulic_shock
Plumbing device
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Grease_trap
Removing positive ions from hard water
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Water_softening
Water heaters that instantly heat water as it flows through the device
the use of energy only when in use, and the elimination of standby energy losses since there is no hot water tank. The main disadvantage of these systems
Tankless_water_heating
Spinning a tool to mix metal workpieces together at the joint, without melting them
Friction stir welding (FSW) is a solid-state joining process that uses a non-consumable tool to join two facing workpieces without melting the workpiece
Friction_stir_welding
Tank used for storing hot water for heating or domestic use
desired operating temperature. Thicker thermal insulation reduces standby heat loss. Water heaters are available with various insulation ratings but it is possible
Hot_water_storage_tank
System in fire prevention
Flammability diagram Flammability limit Flammable liquid Flashover Flash point Friction loss Gas leak Heat transfer Jet fire K-factor (fire protection) Pool fire
Aspirating_smoke_detector
Analysis in fluid dynamics
(junctions and head-loss criteria). Then, use a Root-finding algorithm to find Q values that satisfy all the equations. The literal friction loss equations use
Pipe_network_analysis
Electronic device
Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss Grade (slope) Greywater Heat trap Hydrostatic loop Leak Neutral axis
Water_detector
FRICTION LOSS
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