The heat transfer coefficient (h) for a vapor bubble rising through a boiling liquid is given by                          h ¼ A kVcp d 1=2 where V ¼ g 2 v 1=4 where h ¼ heat transfer coefficient...


The heat transfer coefficient (h) for a vapor bubble rising through a boiling liquid is given by


                         h ¼ A kVcp d




1=2 where V ¼ g 2 v


1=4


where h ¼ heat transfer coefficient [e.g., Btu/(hr8F ft2 )], cp ¼ liquid heat capacity [e.g., cal/(g 8C)], k ¼ liquid thermal conductivity [e.g., J/(s Km)],  ¼ liquid/vapor surface tension [e.g., dyn/cm],  ¼ liquid vapor ¼ 1 v, d ¼ bubble diameter, and g ¼ acceleration due to gravity.


(a) What are the fundamental dimensions of V and A?


(b) If the value of h is 1000 Btu/(hr ft2 8F) for a 5 mm diameter steam bubble rising in boiling water at atmospheric pressure, determine the corresponding values of V and A in SI units. You must look up values for the other quantities you need; be sure to cite the sources you use for these data.

Nov 21, 2021
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