Quiz 3

Question 1

Measure of the amount of energy possessed by the molecules of a substance.

Answer 1

Temperature (T)

Question 2

Energy in transit. Energy as the result of temperature difference

Answer 2

Heat (Q)

Question 3

Force acting through a distance

Answer 3

Work

Question 4

Modes of transferring heat

Answer 4

Conduction and Convection and Radiation

Question 5

Transfer of heat by the interactions of atoms or molecules.

Answer 5

Conduction

Question 6

Transfer of heat by the mixing and motion of macroscopic portions of a fluid.

Answer 6

Convection

Question 7

Example of Convection

Answer 7

Sea and Land Breeze

Question 8

Transfer of heat by electromagnetic radiation

Answer 8

Radiation

Question 9

Heat transfer per unit area

Answer 9

Heat Flux

Question 10

Measure of substances ability to transfer heat through solid by conduction

Answer 10

Thermal Conductivity

Question 11

The thermal conductivity of most liquids and solids varies with ______ ; for vapors, it depends upon ____

Answer 11

Temperature ; Pressure

Question 12

Sometimes referred as a film coefficient and represents the thermal resistance of a relatively stagnant layer of fluid between a heat transfer surface and the fluid medium.

Answer 12

Convective Heat Transfer Coefficient

Question 13

Combines the heat transfer coefficient of the two heat exchanger fluids and the thermal conductivity of the heat exchanger tubes.

Answer 13

Overall heat transfer coefficient

Question 14

For flow adjacent to a hot or cold surface, bulk temperature is the temperature of the fluid that is _______ from the surface.

Answer 14

Far

Question 15

For boiling or condensation, temp bulk is equal to ______

Answer 15

saturation temperature

Question 16

Heat transfer by conduction is dependent upon the _______ of temperature difference and the _______ to heat transfer

Answer 16

driving force ; resistance

Question 17

The ______ to heat transfer is dependent upon the _______ and ________ of the heat transfer medium.

Answer 17

resistance , nature, dimension

Question 18

All heat transfer problems involve the ________, _________ and ________ of the object being studied.

Answer 18

temperature difference, geometry, physical properties.

Question 19

The heat transfer rate is analogous to ______ in electric circuit.

Answer 19

current flow

Question 20

The combination of x, k and A is analogous to _____ in electric circuit

Answer 20

resistance

Question 21

The temperature difference is the ______ or driving function for the heat flow

Answer 21

potential (EMF)

Question 22

Across a cylindrical wall, the heat transfer surface area is continually _______ or ______

Answer 22

increasing, decreasing

Question 23

It involves the transfer of heat by the motion and mixing of macroscopic portions of a fluid.

Answer 23

Convection

Question 24

Type of convection when mixing is caused by density variations resulting from temperature difference within the fluid

Answer 24

Natural Convection

Question 25

Type of convection if the motion and mixing is caused by an outside force, such as pump

Answer 25

Forced Convection

Question 26

Factors that affect the stagnant film thickness:

Answer 26

Fluid velocity Fluid viscosity Heat flux Surface roughness Type of flow (single-phase/two-phase)

Question 27

For flow in pipe, bulk temp is the average temperature at a particular ______ of the pipe

Answer 27

cross-section

Question 28

The convective heat transfer coefficient is dependent on:

Answer 28

Physical properties of the fluid and physical situation

Question 29

Many applications involving convective heat transfer take place within ____, ______ or some similar______

Answer 29

pipes, tubes, cylindrical device

Question 30

Many of the heat transfer processes encountered in thermal facilities involve a combination of both _____ and ______

Answer 30

conduction, convection

Question 31

The convection heat transfer process if strongly _____ upon the properties of the fluid being considered.

Answer 31

dependent