background and objectives: red beet extract concentrate can be used as a natural colorant in food products; however, destructive effects of thermal methods to produce juice concentrate decrease nutritional value in the final product. materials and methods: in this study, red beet extract was concentrated using osmotic distillation method, and the best pretreatment was evaluated to increase the ...

In this paper ,the general solution of steady-state one dimensional asymmetric thermal stresses and electrical and mechanical displacements of a hollow cylinder made of functionally graded material and piezoelectric layers is developed .The material properties ,except the Poisson's ration, are assumed to depend on the variable radius and they are expressed as power functions of radius. The temp...

conducting polymers, because of their special properties, are used to introduce conductive polymeric composites. also, clays have recently been used for preparation of polymer composites with enhanced mechanical and thermal properties. the aim of this work is to study the synergetic effect of the co-presence of conducting polyaniline and montmorillonite in the polyethylene matrix. polyethylene ...

Heat and mass transfer, in this paper, is considered in one-row heat exchanger, that fins are hotter than air flow and water is added to fins. Related governing equations are derived by analyzing a two-dimension model in a unique cell of a heat exchange. These equations are numerically solved by finite difference method. Heat transfer and efficiency under partially wet surface are calculated by...

This study develops thermofluidic pump technology that is powered by heat, rather than by electrical or mechanical power. The objective is to improve the performance of heat-recovery by Organic Rankine Cycles, by using a recently-proposed thermofluidic pump. The thermofluidic pump promises low-cost, high-reliability, and, since it does not consume any of the power produced by the expander, impr...

Mathematical modeling of a three-dimensional PVT system is considered and solved using the FEM. Numerical simulation applied to explore influence solar irradiance on thermal energy, electrical power, total efficiency this system. Water HTF. The irradiance, inlet fluid mass flow rate, ambient temperature, partial shading are all chosen in range 200-500 W/m2, 30-180 L/h, 10-37 °C, 0-30%, accordin...

The interplay between spin transport and thermoelectricity offers several novel ways of generating, manipulating, and detecting nonequilibrium spin in a wide range of materials. Here, we formulate a phenomenological model in the spirit of the standard model of electrical spin injection to describe the electronic mechanism coupling charge, spin, and heat transport and employ the model to analyze...

The aim of this paper is to build a dynamic thermal model of power LED for simulation environment COMSOL. The dynamic thermal model was based on technical and application manufacturer's data of power light emitting diode. In this way the assembled electrical and thermal model of power LED was simulated in a dynamic process of load within Comsol simulation program. The simulation results have be...