Conduction Flashcards
is energy in transit
Heat
is energy transferred as a result of a temperature difference
Heat
is a measure of the amount of energy possessed by the molecules of a substance
Temperature
It is a relative measure of how hot or cold a substance is and can be used to predict the direction of heat transfer.
Temperature
discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems.
Heat transfer
It is a thermal energy in transit due to a spatial temperature difference.
Heat transfer
movement of heat from one body to another by means of conduction, convection, or radiation.
Heat transfer
the rate of heat transfer, 𝑸̇ per unit area.
Heat flux
is a measure of a substance’s ability to transfer heat through itself
Thermal conductivity
is the ∆T that most accurately represents the ∆T for a heat exchanger
Log mean temperature difference
represents a measure of the ability to transfer heat through a stagnant film layer.
Local heat transfer coefficient
is the measure of the ability of a heat exchanger to transfer heat from one fluid to another.
Overall heat transfer coefficient
is the temperature of the fluid that best represents the majority of the fluid which is not physically connected to the heat transfer site.
Bulk temperature
The rate of heat flow a simple homogenous solid is directly proportional to the area measure normal to the direction of flow and the temperature gradient in the direction of heat flow.
Fourier’s law of heat conduction
The concept of overall coefficient of heat transfer is used in case of heat transfer by
Conduction and convection
Unit of thermal conductivity in SI units is
J/ m-K-sec and J/m^2-sec
The unit of overall coefficient of heat transfer is
Kcal/m^2-hr-C or W/m^2-K
Process of heat transfer from one particle of the body to another without the actual motion of particles
Conduction
Process of heat transfer from one particle of the body to another by the actual motion of particles
Convection
Process of heat transfer from a hot body to a cold body, in a straight line without affecting the intervening medium
Radiation
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity
Thermal conductivity
Heat transfer takes place as per
Second law of thermodynamics
Heat of an pbject is known as
Temperature
Metal
Silver
Copper
Aluminum
Non metals
Marble
Fire brick
Cement concrete
Glass
Common brick
Insulating material
Asbestos
Wood
Magnesia
Cork
Glass wool
Static air
Insulating fiber board
The interaction of the molecules
Thermal contact
It is when they achieved same temperature there is no sharing of kinetic energy
Thermal equilibrium
Unidirectional flow of heat through a homogeneous plane wall
Steady state
