© March 2020 | IJIRT | Volume 6 Issue 10 | ISSN: 2349-6002 IJIRT 149098 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY 377 Thermal Performance Comparison of Various Corrugated Channels on a Corrugated Heat Exchanger using CFD Prof. Om Prakash 1 , Abhijeet Kumar 2 1 Corporate Institute of Science and Technology, Assistant Professor, RGPV Bhopal, MP, INDIA 2 Corporate Institute of Science and Technology, Research Scholar, RGPV Bhopal, MP, INDIA Abstract- In recent years, research on the methods for heat transfer enhancement in heat exchangers has received great attention in order to cater for the growing needs of higher efficiencies in these devices. Corrugated surface geometry is one of the many suitable techniques to enhance the heat transfer in heat exchangers. When fluid flows in a corrugated channel, the flow becomes disturbed due to growing recirculation regions near the corrugated wall, which enhances the mixing of fluid as well as heat transfer. On the coolant side, the use of nanofluids, a liquid in which nanoparticles are added to a base fluid, can also enhance the heat transfer due to the improved thermal conductivity of the fluid. The basic geometry of the present problem consists of corrugated channel which included velocity inlet condition and temperature of 300K, pressure outlet condition while slip velocity was ignored. Top and bottom walls for the test section are subjected to a constant heat flux of 10kW/m2 while adiabatic boundary condition is applied to the remaining walls. A numerical simulation is performed on thermal performance comparison of a corrugated channel with three corrugation profiles. Semicircle, triangular, and mixed are considered as corrugation profiles for corrugated walls of channel using nanoparticles volume fractions of Al2O3 and Reynolds number ranging from 0 to 0.06 and 10,000–30,000, respectively. Moreover, the results of triangular and mixed corrugated channel are compared with Semi-corrugated channel. Governing equations are discretized by using a finite volume method (FVM) and SIMPLE algorithm. The second order upwind scheme is applied and standard k-ε turbulent model with standard wall function is selected. The results showed that the Triangular channel has the average Nusselt number greater than 1.3 times of mixed shape (Semi-circular + Triangular) and 1.7 times of Semi-circular corrugated channel. Finally, it was found that among corrugated channels, the triangular channel provides the highest thermal performance followed by the mixed shape (Semi-circular + Triangular) and Semi- circular corrugated channels. Index terms- Nanofluids, Corrugated channels, Reynold’s number, Heat transfer, Nusselt Number, CFD I.INTRODUCTION Heat transfer is a science that explores energy exchange between two entities because of the difference in temperature. In principle, the kinetic energy of microscopic molecules is related to thermal energy. The thermal agitation of its constituent molecules is enhanced if the material's temperature increases [1]. The areas with higher molecular kinetic energy will then shift this energy to areas with lower kinematic energy. Therefore, if an individual or material is at temperatures separate from their surroundings, heat transfer happens to maintain a thermal equilibrium between the body and the surrounding environment [2]. Generally there are three types of heat transfer which are conduction, convection and radiation. Conduction is the transfer of heat within an object or between two objects in contact. Convection heat transfer occurs when a fluid (liquid or gas) comes in contact with a material of a different temperature. For natural convection, it occurs when the flow of a fluid is primarily due to density differences within the fluid due to cooling or heating of that fluid [3,4]. Meanwhile, forced convection occurs when the flow of fluid is primarily due to pressure differences. Radiation is the transfer of heat from one object to another by means of electro-magnetic waves. Radiation does not require objects to be in contact or fluid flow between those objects, it occurs in the void of space (that’s how the sun warms us). Transfer of thermal energy can also occur with any combination of the three. In our study which relates to plate heat exchanger, it consists of heat transfer by conduction and convection.