193 Study of the effect of using Folded Plates arrangement on Heat Transfer Azza A. Abo El- Hassan 1 , Sayed I.Abdel-Mageed 2 , Mohamed S. El Morsi 3 and Osama A. Sharaf 4 ABSTRACT A folded plate is as a corrugated plate in its two directions. The effect of folded plates on the heat transfer is studied experimentally. The temperature distribution of folded plate was compared with flat plate The Arrangement of plates was changed as the following (Flat-Flat), (Flat-Folded), (Folded-Folded). Results are carried out by changing the gap between the two folded plates (1, 4 and 6 cm ) with different air flow rates from 5.4 to 11.2 liter/s, Reynolds number changes from (3969 – 11384) and different heat flux in ranges of 3.8 to10 kW/m 2 based on projective area. The re- sults show that, the folded plate produces faster uniform temperatures distributions on plate surface. By increasing heat flux, the average temperature increases. Also, it is found that as the gap between plates increase, the average plate surface temperature also increases. The obvious effect of the folded plate on temperatures is due to the more turbulence effect on the air flow generated by the geometric of the folded plate. The folded plates are a suitable shape to improve the thermal performance of heat transfer as compared to Flat plate. Keywords: Heat transfer, folded plate, Gap between two folded plates, Heat flux, Flat plate. 1. INTRODUCTION P., Naphon [1] studied effects of corrugated tile angles experimentally and numerically on heat transfer and flow developments in the corrugated channel under con- stant heat flux conditions. P., Naphon and k., Korn- kumjayrit [2] studied numerically the heat transfer and flow developments in the channel with one-side corru- gated studied plate under constant heat flux conditions. Pehlivan et al [3] and H., Pehlivan [4] studied effects the corrugation angle and channel height experimentally on heat transfer and for corrugated channel under constant heat flux conditions. 1 Department of Mechanical Engineering, Faculty of Engineering, Suez Canal University, Egypt Azzaa7575@gmail.com 2 Department of Mechanical Engineering, Faculty of Engineering, Suez Canal University, Egypt Si_Mageed@eng.suez.edu.eg 3 Department of Mechanical power Engineering, Faculty of Engineering, American University, Egypt melmorsi@aucegypt.edu 4 Department of Mechanical Engineering, Faculty of Engineering, Suez Canal University, Egypt osamasharaf@eng.suez.edu.eg Heidary et al. [5] investigated the enhanced heat transfer with corrugated flow channel in anode side of direct meth- anol fuel cells (DMFCs) numerically by using four differ- ent shapes of corrugated boundary (rectangular shape, trapezoidal shape, triangular shape and wavy (sinusoidal) shape). Ahmed et al [6, 7] and Khairul et al [8] studied numerically the effect of copper–water Nano fluid in cor- rugated channel on the heat transfer and flow characteris- tics. Mohammed et al [9] investigated numerically the forced turbulent convective flow and heat transfer in a corrugated channel of plate heat exchanger. The corrugat- ed channel with different corrugated tilt angles, different channel heights and different wavy heights. M., Faizal and M.R., Ahmed [10] studied experimentally effect of the spacing between plates in exchanger to give the optimum heat transfer. P., Naphon [11] studied numerically effect of various geometry configuration wavy plates under con- stant heat flux conditions on heat transfer and flow distri- butions in the channel. Y., Islamoglu and C., Par- maksizoglu [12] investigated the effect of channel height to enhance heat transfer characteristics in a corrugated heat exchanger channel experimentally. W.M., Abed and M. A. Ahmed [13] Investigated numerically Laminar forced con- vection in a corrugated channel with different wavy angle. The results have indicated that heat transfer increase with increasing wavy angle at same Reynolds numbers. H.M., Metwally and R.M., Manglik [14] investigated the en- hanced heat transfer and flow characteristics due to curva- ture-induced lateral vortices in laminar flows in sinusoidal corrugated-plate channels numerically. Kabeel et al [15] investigated the effect of using Nano-particles on corru- gated plate heat exchanger performance experimentally. Sheet folding [16] is a new method for production the three dimensional long sheets from chevron plates. The used folded plate is formed from a flat metal sheet to take the final shape of folded plate. It as air flowing PORT SAID ENGINEERING RESEARCH JOURNAL Faculty of Engineering – Port Said University Volume (21) No. (2) September 2017 pp. 193:198