Experimental study of free convective heat transfer in a direction-sensitive open cavity

Document Type: Full Lenght Research Article


Academic staff in University of Mohaghegh Ardabili


The aim of the present study was to propose a panel being sensitive to the direction of heat transfer. For this purpose, a vertical rectangular cavity with prescribed dimensions was prepared and filled with water as the working fluid. A vertical mid-plane solid partition was installed within the cavity. Two relatively wide openings were created at the top and bottom of the partition and they were so equipped to operate as a pair of one-way flow controllers. The cavity was then fixed between two thick aluminum blocks by which, the contact surfaces of the cavity were maintained at almost constant but different temperatures. Heat transfer rate through the cavity was evaluated for the same temperature difference applied in the two opposed directions. Based on the results, heat transfer rate in one direction was about 30% higher than that of the reverse direction. The difference in the heat transfer rate was obviously due to the individual flow patterns developed within the modified cavity. As a result, the proposed cavity is capable of restricting heat transfer rate in one direction compared to the other, when applying the same temperature difference across the cavity.


Main Subjects

[1].                J. P. Holman, Heat Transfer, 10th ed., McGraw-Hill, (2009).

[2].                H. Singh, P. Eames, A review of natural convective heat transfer correlations in rectangular cross-section cavities and their potential applications to compound parabolic concentrating (CPC) solar collector cavities, Applied Thermal Engineering, 31, 2186- 2196, (2011).

[3].                H.F. Öztop, P. Estellé, M. Yan, K. Al-Salem, J. Orfi, O. Mahian, A brief review of natural convection in enclosures under localized heating with and without nanofluids, International Communications in Heat and Mass Transfer, 60, 37-44, (2015).

[4].                A. Baïri, E. Zarco-Pernia and J.M. García de María, A review on natural convection in enclosures for engineering applications.; The particular case of the parallelogrammic diode cavity, Applied thermal Engineering, 63, 304-322, (2014).

[5].                Z. Zhang, A. Bejan and J.L. Lage, Natural convection in a vertical enclosure with internal permeable screen, Journal of Heat Transfer, 113, 377-383, (1991).

[6].                T. Avedissian, D. Naylor, Free convective heat transfer in an enclosure with an internal louvered blind, International Journal of Heat and Mass Transfer, 51,  283-293, (2008).

[7].                A.J.N. Khalifa and A.F. Khudheyer, Natural convection in partitioned enclosures: experimental study on 14 different configurations, Energy Conversion and Management, 42, 653-661, (2001).

[8].                S.H. Tasnim and M.R. Collins, Suppressing natural convection in a differentially heated square cavity with an arc shaped baffle, International Communications in Heat and Mass Transfer, 32, 94-106, (2005).

[9].                M.A. Coman, G.O. Hughes, R.C. Kerr, R.W. Griffiths, The effect of a barrier on laminar convection in a box with differentially heated end walls, International Journal of Heat and Mass Transfer,  49, 2903-291, (2006).

[10].             E. Rezaei, A. Karami, T. Yousefi and S. Mahmoudinezhad, Modeling the free convection heat transfer in a partitioned cavity using ANFIS, International Communications in Heat and Mass Transfer,  39, 470-475, (2012).

[11].             E. Garoosi, L. Jahanshahloo, M.M. Rashidi, A. Badakhsh, M.E. Ali, Numerical simulation of natural convection of the nanofluid in heat exchangers using a Buongiorno model, Applied Mathematics and Computation, 254, 183-203, (2015).

[12].             M. Ebrahimi, M.B. Shafii, M.A. Bijarchi, Experimental investigation of the thermal management of flat-plate closed-loop pulsating heat pipes with interconnecting channels, 90, 838-847, (2015).

[13].             D. Ernst, J.E. Toth, Unidrectional Heat Pipe, US4683940 A, (1987).

[14].             P. Philip and L. Fagbenle, Design of Lee’s disc electrical method for determining thermal conductivity of a poor conductor in the form of a flat disc, International Journal of Innovation and Scientific Research, 9, 335-343, (2014).

[15].             S.W. Churchill, H.H.S. Chu, Correlating equations for laminar and turbulent free convection from a vertical plate, International Journal of Heat and Mass Transfer, 18, 1323–1329, (1975).

[16].             S.J. Kline and F.A. McClintock, Describing uncertainties in single sample experiments, Mechanical Engineering, 75, 3–8, (1953).