Heat Storage Coefficient of Highly Porous Metal Foams in Two-Phase Systems by Introducing Interfacial Layer

Asian Resonance(P: ISSN No. 0976-8602 RNI No.UPENG/2012/426228 VOL.-III, ISSUE-IV, October-2014 E: ISSN No. 2349 - 9443) 

Abstract


 Jyoti Rani 

S. G. N. Khalsa P. G. College Sri Ganganagar, Rajasthan


Harish Kumar Sublania

 N. D. B. Govt College Nohar, Hanumangarh, Rajasthan.


K. J. Singh

 Govt. College Suratgarh Sri Ganganagar, Rajasthan.


Ramvir Singh

 Thermal Physics Laboratory, Department of Physics, University of Rajasthan.

A theoretical model, to predict the effective Heat Storage Coefficient (Hsc) of highly porous metal foams. The system is reduced to a two-phase system: solid phase, fluid phase and interfacial layer between solid and fluid phases. The resistor model is devloped to find effective heat storage coefficient from the values of Hsc of the constituent phases. In proposed model, we use the concept of averaging the temperature field with in the different phases. To find the value of Hsc in two-phase porous systems, we have to use resistor model, as a porous medium is neither composed of slabs parallel nor perpendicular to the heat flux. We develop a theoretical expression for Hsc based on resistor model for two-phase systems which is being comprised of contributions from both the phase with interfacial layer. It is supposed to use slabs (solid layer, fluid layer and interfacial layer between solid and fluid layers) inclined at an angle θ with the heat flux lines. Here we are trying to correlate angle of inclination θ in terms of the ratio of heat storage coefficient of the constituent phases and the physical porosity. Using best fitting technique we obtained expressions for θ, is used in our model. The theoretical calculations of Hsc for porous metal foam systems carried out by the proposed model gives an average deviation of 4.8% from experimental values given in literature. The values predicted by the model are in good agreement with experimental values of Hsc’s reported in given literature. A comparison with other models available in the literature has also been made. The theoretical Hsc values are determined from present model shows least deviation from experimental values. 

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http://www.socialresearchfoundation.com/upoadreserchpapers/1/25/150223080734english.pdf


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