06-10-2014, 03:36 PM
Abstracts: Double pipe Heat exchangers are used in industrial processes to recover heat between two process fluids. It can sustain high temperature and pressure. It is compact and less expensive. The project carried out for designing the double pipe heat exchanger for its efficient heat transfer within its economical range. The optimum values of inner pipe diameter, outer pipe diameter and different flow rates are used for a pipe in pipe heat exchanger of a given length for finding out efficient heat transfer between hot and cold fluid. Experiment has been done for pipe in pipe heat exchanger with simple inner tube and the tube with semi-circular fins. The number of fins are 18 on each tube which was arranged in alternate manner with successive spacing between fins is 50 mm. The height and thickness of fins are taken as 10 mm and 1.6 mm respectively. Different parameter like overall heat transfer, Nusselt Number, convective heat transfer coefficient, pressure drop, friction factor are compared for simple inner tube and finned tube. The project also includes the numerical analysis using preprocessor GAMBIT AND solvent FLUENT fluid analysis software. Pipe in pipe heat exchanger type 2-2U type of heat exchanger is used for present simulation. Model is generated using pre processor GAMBIT. The tetrahedral hybrid element is used for the meshing. The boundary type applied in this study is velocity inlet for both Shell and tube inlets. A pressure outlet is applied at shell outlet and tube outlet. For the turbulence the standard k-e model is selected. Simulations are executed using CFD commercial code FLUENT. Temperature for inlet and outlet condition were calculalted. The result obtained from numerical analysis has been correleated with the experimental result and final conclusion are made.