True or False, explain. Factors that may allow one to model a control volume as

Question

True or False, explain. Factors that may allow one to model a control volume as having negligible (zero) heat transfer include (1) the outer surface of the control volume is well insulated, (2) the outer surface area of the control volume is too small to permit effective heat transfer, (3) the temperature difference between the control volume and its surroundings is so small that the heat transfer can be ignored, and (4) the working fluid passes through the control volume so quickly that there is not enough time for significant heat transfer to occur.

Explanation / Answer

In the energy rate balance, the heat transfer rate term set to zero because it is small relative to other energy transfers across the boundary.

This may be the result of one or more of the above given factors-

All are True.

The boundary defining the control volume is extremely thin that heat transfer can be ignored.Fluid flow speed is also high to give surrounding and system very less time to interact.

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