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Effect of double thermal modulation on heat transfer in a square cavity heated from bellow

This paper deals with the investigation of thermo-vibrational convection induced by harmonic vibrations of the temperature boundary conditions in a square cavity heated from bellow and containing a low Prandtl number fluid. The governing equations are solved by using a finite volumes method. | Effect of double thermal modulation on heat transfer in a square cavity heated from bellow Engineering Solid Mechanics 2 2014 139-144 Contents lists available at GrowingScience Engineering Solid Mechanics homepage www.GrowingScience.com esm Effect of double thermal modulation on heat transfer in a square cavity heated from bellow Aziz Akhiatea Al alami Semmaa El Ganaouib and Abdelah Anouara a Université Hassan 1er FST de Settat B.P. 577 Settat Maroc b University of Limoges SPCTS UMRCNRS 66 38 Limoges France ART ICLE INFO ABSTRACT Article history This paper deals with the investigation of thermo-vibrational convection induced by harmonic Received September 20 2013 vibrations of the temperature boundary conditions in a square cavity heated from bellow and Received in Revised form containing a low Prandtl number fluid. The governing equations are solved by using a finite October 14 2013 volumes method. Effects of thermal modulation on the all regimes occurring in the cavity when Accepted 12 January 2014 Available online convection intensity increases are analyzed. A characteristic modulation frequency allowing the 14 January 2014 reduction of the average intensity of the flow and heat transfer at the cold wall has been Keywords identified. The effect of phase difference between hot and cold temperature is also studied. Thermo-vibrational convection Square cavity Finite volumes method 2014 Growing Science Ltd. All rights reserved. NOMENCLATURE C dimensionless concentration thermal diffusivity D mass diffusivity expansion coefficient g gravitational acceleration kinematic viscosity of fluid H height of the enclosure density of fluid k thermal conductivity dimensionless stream function Le Lewis number D SUBSCRIPT c critic N buoyancy ratio C C T T C cold Nu Nusselt number see Eq 9 H hot Pr Prandtl number max maximum S solutal Ra thermal Rayleigh number g T T H 3 T thermal Sh Sherwood number 0 reference t time SUPERSCRIPT Corresponding author. E-mail addresses .