© December 2018 | IJIRT | Volume 5 Issue 7 | ISSN: 2349-6002 IJIRT 147311 INTERNATIONAL JO URNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY 40 CFD analysis of vertical closed loop pulsating heat pipe with 10 turns Sunil Bhatt 1, Aditya Singh 2, Gaurav Purohit 3, Anoo Dadhich 4 1 M.Tech Student, Aravali Institute of Technical Studies, Udaipur, Rajasthan 2 Assistant Professor, Aravali Institute of Technical Studies, Udaipur, Rajasthan 3,4 Assistant Professor, Aravali Institute of Technical Studies, Udaipur, Rajasthan Abstract- CLPHP is a device which combines the principles of both thermal conductivity and phase transition to efficiently manage the transfer of heat between two solid interfaces. Geometry of CLPHP with 10 turns was modeled having Inside and Outside diameter of pipe are 3 mm and 4 mm respectively. Length of pipe is 450 mm and 12 mm is the gap between the pipes. Total length of the pipe is taken as 6 m. For achieving better results grid independent study is done, element size .5 mm , 2 mm and 3 mm are selected . Different kind of mesh has been checked for simulations and 0.5 mm element size mesh is found optimum and selected for further analysis. Numerical model developed is very helpful in observing the working phenomenon of CLPHP. Mostly analysis of closed loop pipe was performed in vertical position with refrigerants having different filling ratio. When the filling ratio of the CLPHP was marked as 50% highest performance curve was obtained. Thermal contact resistance offered by the CLPHP at this filling ratio was found to be minimum leading to high performance of structure. INTRODUCT ION A Heat-transfer equipment competently combining the basic principles of heat transfer and phase transition in order to transmit heat b/w both solid interfaces called heat pipe. A solid surface which is thermally conductive turns into vapor at the higher temperature interface of a heat pipe by absorbing liquid heat in contact. After that by releasing heat the vapor condenses into liquid while traveling along the cold interface of heat pipe. After that liquid enters the hot interface because of capillary action, gravity, or centrifugal force, and the cycle repeats. Heat pipes are regarded as effective thermal conductors, because of its high heat transfer coefficients available for condensation and boiling. The primary motive of a cooling system is to increase the performance and the reliability of module or package, reliability indeed was strongly considered as a temperature function. The role of temperature is very important role in administrating Device functionality, safety and failure. Fig.1. Open and closed loop heat pipe -hydraulic coupling were termed as closed loop pulsating heat pipes (CLPHPs). Close Loop Pulsating heat pipes (CLPHPs) were very well suited in microelectronics cooling consisting of a plain very thin and delicate capillary tube having many U-turns joined at each ends to each other. The pipe was initially emptied and further was filled partially with working fluid. Due to small diameter of Close Loop Pulsating heat pipe, the fluid distributes itself into an arrangement of liquid slugs and vapor bubbles. This liquid–vapor/slug-bubble system receives heat from one end of tube bundle transferring it to the other end by a pulsating action of the fluid. The type of fluid and the operating pressure inside the pulsating heat pipe decides the operating temperature of the heat pipe. The region between evaporator and condenser was assumed to be adiabatic. The heat was transferred from evaporator to condenser by the means of pulsating action of vapor slug and liquid