This article treats the local heat transfer for nucleate pool boiling around the cylinder using the inverse heat conduction analysis. The physical model considers a half section of a cylinder with unknown surface temperature and heat flux density. The iterative regularization and the conjugate gradient methods are used for solving the inverse analysis. The local Nusselt number profiles for nucleate pool boiling are presented and analyzed for different electric heat. The mean Nusselt number estimated by IHCP is closed with the measured values. The results of IHCP are compared to those of Cornewell and Houston (1994), Stephan and Abdelsalam (1980) and Memory et al. (1995). The influence of the error of the measured temperatures and the error in placement of the thermocouples are studied.

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An implicit finite difference scheme is used to solve the problem of condensation of pure vapors flowing vertically downwards around a horizontal tube. The incompressible flow equations coupled at the interface for the liquid and vapor phases are solved. The pressure gradient, inertia, and enthalpy convection terms are retained in this analysis, and the influence of turbulence in the two phases is considered. The calculated results for laminar flow and those from different mixing length turbulence models are compared with experimental results for condensation of steam and R113. The results presented show that the average condensation heat transfer coefficients obtained using Kato’s turbulence model in the condensate film and Pletcher’s model in the vapor phase, are in good agreement with the experimental data.