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Cooling and lubrication
Chapter 8
21
Mechanical Engineering
12th Grade
02/13/2012

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Cards

Term
Thermal expansion
Definition
The expansion of a material when it is subjected to heat.
Term
Thermal Growth
Definition
The increase in size of a material when heated with little or no change back to the original dimensions
Term
Conduction
Definition
The heat transfer that occurs from atom to atom when molecules come in direct contact with each other, and trough vibration, when kinetic energy is passed from atom to atom.
Term
Plenum
Definition
A duct that provides a specific path for air to enter an engine cooling system
Term
Hot soak back
Definition
The period immediately following the initial shutdown of an engine when cooling air flow has stopped and the engine enclosure temperature increases for a brief time.
Term
Water pump
Definition
an engine component that moves coolant through passages of a liquid cooling system
Term
Friction
Definition
The resistance to motion that occurs when two surfaces slide against eah other.
Term
Viscosity
Definition
The internal resistance to flow of a fluid
Term
Multi viscosity
Definition
An oil that has the characteristics of two viscosity ratings for the required flow at low ambient temperatures and has adequate oil film protection at high operating and/or ambient temperatures.
Term
Splash lubrication
Definition
An engine lubrication system in which oil is directed to moving parts by a splashing motion
Term
Slinger
Definition
A splash lubrication system component used on vertical crankshaft engines cosisting of a spinning gear with multiple paddles cast into the plastic gear body.
Term
Water jacket
Definition
A series of interconnected cavities cast into the engine block and cylinder head for the circulation of coolant
Term
Coolant
Definition
A mixture of water and antfreeze used in liquid-cooled engines that is circulated throughout the engine cylinder block and other engine components
Term
thermal conductivity
Definition
The ability of a material to conduct and transfer heat
Term
Coefficient of thermal expansion
Definition
The unit change in dimension of a material by changing the temperature 1 degree F
Term
Thermal distortion
Definition
An asymmetrical or nonlinear thermal expansion of a material
Term
Cooling fan
Definition
an engine component that supplies cooling air to the engine when rotated
Term
Blower housing
Definition
Sheet metal or composite material component that encompasses the fan to direct cooling air to the cylinder block and cylinder head
Term
Thermostat
Definition
A valve placed between the radiator and the engine block on liquid cooled engines that regulates the flow of coolant
Term
Polymer
Definition
A molecule consisting of repeating structural units that have been chemically formulated to perform in a specific manner
Term
Dipper
Definition
an engine component attached to the connecting rod which directs oil from the oil resevior to bearing surfaces
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