Heat transfer by free convection between horizontal concentric pipes

Abstract EN

research deals with the theoretical and experimental study of free convection heat transfer between horizontal concentric pipes of constant inner and outer cylinders temperature, respectively and (Ti>To).

The finite elements method was used to solve the numerical relations of momentum and energy equations.

The numerical solution has been included the calculation of the temperature and velocity values between the cylinders by using ANSYS program (finite element analysis structural system).

Different models of concentric double pipes were created and tested with different diametral ratios.

Nusselt number was obtained for a range of temperature difference (T=Ti-To) of (6.01-120.42C0).

The results also showed that the average heat transfer coefficient values at the inner and outer radii respectively increased with the increasing of Rayleigh number and the ratio of outer to inner radius.

The theoretical and experimental results were compared with some of researches that presented in the literature to achieve the verification of the results obtained from the numerical analysis and experimental modeling for the heat transfer between concentric double pipes.

The results are in good agreement.