18,139 research outputs found
Laminar film condensation heat transfer on a vertical, non-isothermal, semi-infinite plate
This paper gives similarity transformations for laminar film condensation on
a vertical flat plate with variable temperature distribution and finds
analytical solutions for arbitrary Prandtl numbers and condensation rates. The
work contrasts with Sparrow and Gregg's assertion that wall temperature
variation does not permit similarity solutions. To resolve the long debatable
issue regarding heat transfer of non-isothermal case, some useful formulas are
obtained, including significant correlations for varying Prandtl numbers.
Results are compared with the available experimental data
Heat transfer in the flow of a cold, axisymmetric vertical liquid jet against a hot, horizontal plate
The paper considers heat transfer characteristics of thin film flow over a
hot horizontal flat plate resulting from a cold vertical jet of liquid falling
onto the surface. A numerical solution of high accuracy is obtained for large
Reynolds numbers using the modified Keller box method. For the flat plate,
solutions for axisymmetric jets are obtained. In a parallel approximation
theory an advanced polynomial approximation for the velocity and temperature
distribution is employed and results are good agreement with those obtained
using a simple Pohlhausen polynomial and the numerical solutions
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