When the heat pipe’s evaporation section is filled with flue gas, what is the typical value for the mass flow rate facing it?
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Heat pipes have many applications; some are used in large-scale industrial processes, while others are employed in CPU coolers. The devices that use them vary in size, and when designing such systems, it’s necessary to determine the mass flow rate. After reviewing several design examples, it was found that the values varied, but they were generally around 2 kg/m2·s or so. Is the face-on mass flow rate the same for large and small devices?
This needs to be calculated; check it in the book.
Generally, when designing, doesn’t one have to determine the mass flow rate facing the surface first? And then design based on this flow rate
Typically, a mass flow rate is assumed to calculate the heat transfer coefficient. 2.5 is usually chosen, but in practical applications the mass flow rate varies due to factors such as pressure drop and self-cleaning capability.
It depends on how large the allowable pressure drop is. If an increase in pressure drop is allowed, the flow rate can be set higher.
I’ve encountered the same problem as well; I’m not sure if it’s possible to first set the desired windward area and then calculate the mass flow rate accordingly