Calculation of the boiling heat transfer film coefficient problem
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When calculating the boiling heat transfer film coefficient, there is a parameter known as the boiling number Bo, which is given by Bo = q/(m*△hv), that is, the ratio of heat flux to mass flow rate and vaporization enthalpy. When calculating the boiling heat transfer of a mixture, how should the heat flux be determined? Should the average heat flux of the heat exchanger be used? Is the vaporization enthalpy the vaporization enthalpy of the vaporized portion? How should it be calculated? Seeking an answer
I’m not sure where the formula comes from. By conventional understanding, heat flux is usually an average value, and the enthalpy of vaporization refers to that of such a mixture. The phrase “enthalpy of vaporization of the vaporized portion” is strange; generally, it is the sum of the products of the enthalpy of vaporization of each substance and its proportion in the mixture.
I didn’t express myself very clearly. Thank you for your explanation; it was a great help to me