Analytical models are presented for conduction shape factors for three-dimensional regions formed between an isothermal, arbitrarily-shaped body and its concentric, arbitrarily-shaped surrounding enclosure. The model is based on the exact solution for the concentric spheres and two methods are developed to predict the effective gap spacing. The models are validated using existing numerical data...

Analytical models are presented for conduction shape factors for three-dimensional regions formed between an isothermal, arbitrarily shaped body and its concentric, arbitrarily shaped surrounding enclosure. The model is based on the exact solution for the concentric spheres, and two methods are developed to predict the effective gap spacing. The models are validated using existing numerical dat...

In present study, a 2D rectangular enclosure was considered as latent thermal energy storage (LTES) system. Lauric acid used PCM material. The aim of this study to use fins enhance melting process PCM. Position and shape double were investigating parameters. At first stage three different positions for shape. Results indicated that amongst aforementioned cases, best results achieved when locate...

numerical study of double-diffusive natural convective heat transfer in a curved cavity filledwith a porous medium has been carried out in the current study. polar system has beenselected as coordinate system. as a result, all equations have been discredited in r and θdirections. brinkmann extended darcy model has been utilized to express fluid flow inporous matrix in the enclosure. smaller and...

Natural convection is intensively explored, especially in a valley-shaped trapezoidal enclosure, because of its broad presence both technical settings and nature. This study deals with cavity, which initially filled linearly stratified air. Although the sidewalls remain adiabatic, bottom wall heated, top cooled. For fluid (air), temperature adjacent to walls same as that walls. cavity simulated...