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(Solved): Boiling. Consider water boiling on a solid flat surface. Given the boiling curve reported below (fr ...
Boiling.
Consider water boiling on a solid flat surface. Given the boiling curve reported below (from Figure 10.4):
A. Estimate the heat flux (?????????? ) and heat transfer coefficient (h) associated with the following excess temperatures:
????????? = 3 °C, ????????? = 20 °C, and ????????? = 100 °C. Which condition leads to the highest heat transfer coefficient?
OBS: Remember that the axes are reported in logarithmic scale!
B. Calculate the value for heat transport coefficient at ????????? = 3 °C from equation (NuL = 0.15 RaL1/3 (107<RaL<1011, all Pr)) (for free convection) and compare the results with your estimated value found in the question above (A).
Boiling regimes FIGURE 10.4 Typical boiling curve for water at 1 atm: surface heat flux \( q_{s}^{\prime \prime} \) as a function of excess temperature, \( \Delta T_{e} \equiv T_{s}-T_{\text {sat }} \)