Author:
B. N. Veena ,N. Srikantha ,S. Sushma ,M. Uma
Abstract
In the present paper we carried out linear stability analysis for ethylene glycol-copper nanoliquid-saturated porous medium. The thermal properties of baseliquid, nanoparticles and porous medium are used in the calculation of properties of nanoliquid and nanoliquid saturated porous medium using phenomenological laws and mixture theory. The rigid-free isothermal boundaries are considered in the study. Analytical expression for critical Rayleigh number is presented in the paper. Dissimilar shapes of nanoparticles are examined and their effect on the onset of convection is studied in great detail. In addition the effect of various parameters namely porous parameter, aspect ratio, volume fraction are also studied and analysed graphically. It is observed that the onset of convection is advanced when nanoparticles are added to baseliquid whereas delayed in the addition of the porous medium to the nanoliquid. Unicellular convection is possible only when the aspect ratio lies in the range 0.8 < A < 2 .
Publisher
Informatics Publishing Limited
Subject
Energy Engineering and Power Technology,Geotechnical Engineering and Engineering Geology,Fuel Technology
Reference30 articles.
1. Minkowycz WJ, Sparrow EM, Abraham JP. Nanoparticle heat transfer and fluid flow. CRC press; London, New York, 2012 Dec 4.
2. Taylor R, Coulombe S, Otanicar T, Phelan P, Gunawan A, Lv W, Rosengarten G, Prasher R, Tyagi H. Small particles, big impacts: A review of the diverse applications of nanofluids. Journal of Applied Physics. 2013 Jan 7; 113(1).
3. Bianco V, Manca O, Nardini S, Vafai K. Heat transfer enhancement with nanofluids. CRC press; London, Newyork, 2015 Apr 1.
4. Choi SUS, Eastman JA. Enhancing thermal conductivity of fluids with nanoparticles. Argonne National Lab. (ANL), Argonne, IL (United States); 1995 Oct 1.
5. Masuda H, Ebata A, Teramae K, and Hishinuma N. Alteration of thermal conductivity and viscosity of liquid by dispersing ultra-fine particles. Dispersion of of Al 2O3, SiO2 and TiO2 ultra-fine particles. Netsu Bussei 1993; 227(7)