Question 309General Subjects - Assistant Engineer70% to pass
What statement is true concerning heat transfer rates by the heat transfer mode of natural convection?
AI Explanation
The correct answer is A) Heat transfer rates are directly proportional to the difference in fluid densities which, in turn, is directly proportional to the temperature gradient.
This is correct because in natural convection, the driving force for heat transfer is the difference in fluid densities caused by temperature differences. As the temperature gradient increases, the difference in fluid densities also increases, which in turn, directly increases the heat transfer rate by natural convection.
The other options are incorrect because they do not accurately describe the relationship between heat transfer rates, fluid density differences, and temperature gradients in natural convection.
Related Questions
#307 Overall heat transfer processes often involve two or more modes of heat transfer. Specifically, when heat is being transferred from one side of an air compressor cylinder wall to the opposite side, what mode of heat transfer is associated with that particular part of the overall process? #308 What statement is true concerning the heat transfer rates through a heat exchanger boundary wall by conduction? #310 What statement represents the first law of thermodynamics? #311 What statement represents the second law of thermodynamics? #312 If Boyles' law describes the relationship between the pressure and volume of ideal gases, what statement is true?