This paper deals with the hydrodynamic and thermal analysis of a new type of porous heat exchanger (PHE). This system operates based on energy conversion between gas enthalpy and thermal radiation. The proposed PHE has one high temperature (HT) and two heat recovery (HR1 and HR2) sections. In HT section, the enthalpy of flowing high temperature gas flow that is converted to thermal radiation em...

The presence of porosity in a material was first shown by Robert Hooke (1635–1703) who, in his investigations of the natural world using the newly available microscope, observed that the structure of cork was based on regular hollow units which he termed “cells”, because they reminded him of the cells of a monastery. Indeed, the fact that most natural structures are porous is a clear indication...

Many optical sensors exploit the interesting properties of porous materials, as they ensure a stronger interaction between light and analyte directly within structure. Most are mainly based on silicon anodized aluminum oxide, showing high sensitivities. However, top-down strategies usually employed to produce those materials might offer limited control over layer, which could affect homogeneity...

The objective of this work is to develop porous maize stalk cellulose fiber-reinforced geopolymer composites for heat insulation on the bottom side an electric stove using solid impregnation method. Heat loss measurement conducted infrared thermometer. Moreover, temperature effect investigated. fibers are very essential anticipate cracking phenomenon generated by high temperatures. degradation ...

Porous microstructure is a common surface morphology that widely used in antifouling, drag reduction, adsorption, and other applications. In this paper, the lattice gas automata (LGA) method was to simulate non-uniform electrochemical machining of porous structure at mesoscopic level. cellular space, metal electrolyte were separated into orderly grids, migration corrosive particles determined b...

according to the former researcher’s presented relations for flow through rock-fill porous media, the effects of physical characteristics was not studied separately. hence, due to the application of these relations, physical characteristics of porous materials effect must be investigated separately. in various constructed physical models of porous media, the effect of several variables such as ...

The process of formation and deposition gas hydrates on the walls a well during its joint operation with reservoir heat exchange environment is modeled. problem reduced to solving differential equations describing non- isothermal flow an imperfect both in porous medium well, propagation rocks appropriate coupling conditions. It shown that for wells temperature significantly exceeding equilibriu...

1 Fellow, ASME Abstract A semi-empirical model for conduction/convection in a thin “fin-like” porous wall of arbitrary composition and thickness is developed. The model assumes one-dimensional conduction in the porous matrix and one-dimensional flow of the coolant through the wall. Closed form solutions are obtained for a uniform composition and thickness porous wall having an insulated tip. An...

a numerical model is developed to simulate the transport phenomena in the flow channel between parallel plates with porous and non-porous (or impermeable) walls. the continuity and momentum equations were solved first, assuming the wall reynolds number in the range of with the suction or injection of air at a speed equal to the uniform inlet velocity. the results show that at constant inlet and...

this work presents a numerical study to investigate the heat transfer characteristics of a 2-d rectangular composite porous radiant burner (cprb). in the construction of porous burner, the porous layer is considered to be of composite type consisting of upstream and downstream layers with equal thickness but with different physical and radiative properties. in the present work, a two dimensiona...