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Heat Transfer > HT Chapter 2 > Flashcards

HT Chapter 2 Flashcards

1
Q

What is Conduction

A

Conduction is the transport of energy in a medium due to temperature gradient and by the random atomic or molecular activity.

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2
Q

Isothermal

A

same temperature

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3
Q

adiabatic

A

the temperature of a surface which cannot absorb or lose heat to the environment

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4
Q

Isotropic

A

the properties of a material which is independent of the direction

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5
Q

L

A

Thickness

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6
Q

Lambda mfp

A

Electron mean free path, average distance traveled by an electron before it collides with either an imperfection in the material or with a phonon.

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7
Q

specific heat

A

the amount of heat that must be added to one unit of mass of the substance in order to cause an increase of one unit in temperature.

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8
Q

thermal diffusivity

A

ratio of thermal conductivity to heat capacity

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9
Q

meaning of incompressible

A

constant density

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10
Q

cp

A

Specific heat at constant pressure

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11
Q

cv

A

specific heat at constant volume

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12
Q

q dot

A

rate at which energy is generated per unit volume (W/m^3)

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13
Q

watt units

A

j/s

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14
Q

alpha- meaning, formula, definition

A

thermal diffusivity, k/cp*row,thermal conductivity divided by density and specific heat capacity at constant pressure.

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15
Q

What does heat equation allow?

A

Heat equation allows us to calculate distribution of temperature vs time and x y and z

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16
Q

Thermal Conductivity

A

A measure of a materials ability to transfer thermal energy by conduction, symbol is K, and units is W/m^2

17
Q

Thermal Diffusivity definition.

A

A measure of a material’s ability to respond to changes in its thermal environment.

18
Q

What are the two components of thermal conductivity of metallic solids?

A

thermal conductivity of electrons and thermal conductivity of the lattice

19
Q

What are the two components of thermal conductivity of non metallic solids?

A

thermal conductivity of the lattice

20
Q

Why is thermal conductivity of pure metals higher then that of allows?

A

because pure metals have more free electrons

Heat Transfer (8 decks)

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