Stagnation point flow over a heated plate : consideration of gas jet velocity profiles

Abstract EN

Stagnation point heat transfer is an important issue in several engineering applications.

In the present study, the modeling of stagnation point flow onto a heated plate is carried out for different gas jet exit velocity profiles.

The Reynolds stress model is introduced to account for the turbulence and the turbulence properties are computed for each gas jet exit velocity profile.

An axisymmetric gas jet is considered, which in turn results in two-dimensional cases to handle.

Gas jet and material properties are considered as constant as well as variable (temperature dependent) in the simulations.

The study is extended to include the entropy analysis, due to fluid friction and heat transfer in the stagnation region.

It is found that the fluctuation velocities predicted agree well with the experimental results obtained from a previous study for gas jet exit velocity with 1 / 7–1 / 10 powers ; however, the gas jet exit velocity profiles with 1 / 2 power predicts the highest turbulence kinetic energy in the stagnation region.

Similarly, the volumetric entropy generation due to viscous dissipation is higher for the gas jet exit velocity profile with 1 / 2 power as compared to its counterparts corresponding to other gas jet exit profiles.