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Laminar film boiling on a porous vertical wall with uniform suction velocity
Author(s) -
Krishnamurthy M. V.,
Ramachandran A.
Publication year - 1971
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450490405
Subject(s) - suction , laminar flow , prandtl number , boiling , heat transfer , mechanics , thermodynamics , materials science , boundary layer , boundary layer suction , physics , boundary layer thickness , boundary layer control
Laminar free convection film boiling on a porous vertical wall with uniform suction or blowing is analysed using boundary layer theory. The solutions are obtained assuming suction or blowing to be a disturbance superposed on the isothermal, impermeable wall case. Using a parameter involving the suction or blowing velocity, universal functions are derived for various values of Prandtl Number and c p (T w — T sat )/h fg Pr. These universal functions can be used to estimate the heat transfer rate in the presence of suction or blowing. As expected, suction increases the heat transfer rate while blowing decreases the heat‐transfer. Even small velocities of suction or blowing could significantly affect the heat transfer. It is also found that the effects of suction or blowing are more pronounced at lower wall superheats.