Natural convection heat transfer has many applications in different fields of industry; such as cooling industries, electronic transformer devices and ventilation equipment; due to simple process, economic advantage, low noise and renewed retrieval. Recently, heat transfer of nanofluids have been considered because of higher thermal conductivity coefficient compared with those of ordinary fluid...

Radiative heat transfer in a complex two-dimensional enclosure with an absorbing, emitting, and isotropically scattering gray medium is investigated by using the finite-volume method. In particular, an implementation of the unstructured polygonal meshes, based on an unstructured triangular system, is introduced, thereby reducing the computation time required for the analysis of thermal radiatio...

The phenomena of magneto-hydrodynamic natural convection in a two-dimensional semicircular top enclosure with triangular obstacle the rectangular cavity were studied numerically. governing differential equations are solved by using most important method which is finite element (weighted-residual method). wall placed at cold Tc and bottom heated Th. Here sidewalls assumed adiabatic. Also all occ...

The temperature distribution and distortion of fluid flow inside the closed cavities, square triangle, are studied for different boundary conditions. Two conditions thermal used studying cavities: (i) Left wall is hot, right cold, top bottom walls adiabatic. (ii) adiabatic, hot. For triangular enclosure, vertical insulated, insulated inclined kept cold in both velocity observed by means stream ...

Solar heating is one of the important utilities of solar energy both in domestic and industrial sectors. Evacuated tube heaters are a commonly used technology for domestic water heating. However, increasing cost of copper and nickel has resulted in huge initial cost for these types of heaters. Utilizing solar energy more economically for domestic use requires new concept which has low initial a...

This paper is based on the numerical investigation of natural convection two vertical enclosure square and triangular cavity with air filled. The consist adiabatic hot cold wall wide range Rayleigh number from 103 to 106 aspect ratio 1 10 at interval 2.5. Flow patterns isotherm plots were used display results, for every case, local mean Nusselt values also produced. results show that an increas...