Journal of Mechanical Engineering Research and Developments (JMERD) 42(4) (2019) 272-276 Cite The Article: Muna S. Kassim (2019) Experimental Investigation Into The Influence Of Porous Media On The Mixed Convection Heat Transfer Induced Inside Sec tor- Shaped Channel . Journal Of Mechanical Engineering Research And Developments , 42(4) : 272-276. ARTICLE DETAILS Article History: Received 29 July 2019 Accepted 30 August 2019 Available online 12 September 2019 ABSTRACT This paper presents the results of an experimental study that was developed in order to analyze the thermal energy exchanged and produced by means of convection between a flowing fluid and the internal surface of a channel, completely filled with a saturated porous medium, while the side walls were subjected to a constant and uniform heat flux and the lower and upper walls were perfectly insulated by thermal means. The experiment was conducted in the thermally and hydro-dynamically fully developed flow region. During the experiments, the local Nusselt number and temperature distribution along the channel length have been studied for Peclet number range of (65.2-384.6) and Rayleigh number range of (3.5-189.2). The results obtained after performing this experimental evaluation indicated that the porous mediums play an important role in the thermal exchange process. Also, it was observed that an increase in the Peclet and Rayleigh numbers results in an enhancement of the thermal energy exchange rate. It was also concluded that a decrement on the Local Nusselt Number is tightly related with a decrease of the channel length, but the mentioned dimensionless number then became stable in the fully developed flow region and increased until it reached the end of the channel, presenting a positive linear trend. KEYWORDS mixed convection, porous media, glass balls, horizontal channel. 1. INTRODUCTION The heat transfer through a porous medium is a significant phenomenon that can be exploited in many industries and natural fields such as filtrations, dryings, and condensation of gases on surfaces. The existence of porous media in the environment helps specialists to deal with underground water, disposal of radioactive waste and soil cleaning. It is also employed in the mechanical industries, such as in the manufacture of flexible insulation materials such as a soluble polymer, foam insulation, drying efficiency and storage of absorbed solarenergy. A researcher conducted a numerical study to estimate the thermal energy exchange through means of mixed convection between a porous media and a horizontal rod using a vertical flow forced upwards and downwards, always guaranteeing a Prandtl number of 0.7 [1]. In order to obtain an approximate solution for the system in a steady state analysis, a method combining the finite differences method with series truncation was applied for different magnitudes of the Reynolds Number (5, 10, 20, 50 and 100) and the Grashof Number (0, 40, 80 and 400). The results demonstrated that the theory is well described by these systems both at high and low magnitudes of the Grashof Number. A researcher investigated experimentally the mixed convection heat transfer in a circular tube filled with porous media and subjected to a constant and uniform heat flux in inclined and horizontal tubes [2]. During this analysis, several values of the Rayleigh Number (from 108.4 to 907.9) were used, as well as different magnitudes of the Peclet Number (from 29.3 to 516.9). The experimental results showed that the Nusselt Number is higher when tube is evaluated being completely horizontal, and finally, the author established the differences between three different cases for the convective heat transfer mechanisms: a lower Peclet Number results in natural convection; a Medium Peclet Number indicates mixed convection, whilst a higher Peclet Number is evidence of forced convection. A researcher performed an analytical and experimental evaluation of the mixed convective heat transfer mechanism for a fluid flowing over a rotating heat exchanger with the side walls exposed to a uniform and constant heat flux and with upper and lower walls perfectly insulated in the thermal sense [3]. The results obtained from this analytical investigation indicated that the center position of the secondary flow is completely based on the magnitude of the Rayleigh number and that the center rises when this dimensionless parameter is lower. On the other hand, the results obtained from the experimental analysis brought up that the Nusselt Number tend to increase with the Reynolds Number when the flow regime is laminar, with a variation between the theoretical and the experimental values of 9%. A researcher carried out an analytical study of the impact of the apex angle in the heat transfer mechanism of mixed convection between a porous media and the internal surfaces of a horizontal channel [4]. For this study, different apex angles (30°, 60°, 75°, and 90°), as well as several Rayleigh Numbers (from 100 to 1000) were employed with a constant Peclet Number. The author reached the conclusion that the local Nusselt Number diminished its magnitude with higher apex angles when the Rayleigh Number was 1000; whilst the Nusselt Number increased with the apex angles for a Rayleigh Number of 100. A researcher conducted an experimental and analytical evaluation of the heat transfer given by mixed convection analyzing the thermal exchange between a porous media subjected to a uniform and constant heat flux and temperature, with water as the working fluid [5]. The results obtained by the application of this study indicated that with a Rayleigh Number between 0 and 500 with a Peclet Number of 10, the influence of the free convection Journal of Mechanical Engineering Research and Developments (JMERD) DOI : http://doi.org/10.26480/jmerd.04.2019.272.276 EXPERIMENTAL INVESTIGATION INTO THE INFLUENCE OF POROUS MEDIA ON THE MIXED CONVECTION HEAT TRANSFER INDUCED INSIDE SECTOR-SHAPED CHANNEL Muna S. Kassim * Mechanical Engineering Department, Engineering, College, Mustansiriyah University, Baghdad – Iraq *Corresponding Author E-mail: munakassim@uomustansiriyah.edu.iq This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ISSN: 1024-1752 CODEN : JERDFO RESEARCH ARTICLE