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Heat and Mass Transfer

Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

K.cal (heat)
Hr (time)
°C (temperature)
Sq. m (area)

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Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Thickness
Time
Temperature
Area

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Cross flow type
Regenerator type
Parallel flow type
Counter flow type

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Biot number
Nusselt number
Peclet number
Stanton number

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

20°C
66.7°C
40°C
60°C

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Heat and Mass Transfer
Joule sec is the unit of

Universal gas constant
Thermal conductivity
Planck's constant
Kinematic viscosity

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