TO DEDUCTION OF MASS FLOW RATE FOR HELICAL HEAT EXCHANGER AT MULTIPLE CROSS - SECTIONS USING CFD

Enhancing the heat transfer by the use of helical coils has been studied and researched by many researchers, because the fluid dynamics inside the pipes of a helica l coil heat exchanger offer certain advantages over the straight tubes, shell and tube type heat exchanger, in terms of better heat transfer and mass transfer coefficients. Various configurations of coil structure are possible, and the configuration in whi ch there is a series of vertically stacked helically coiled tubes is the most common type. This configuration offers a high compact structure and a high overall heat transfer coefficient; hence helical coil heat exchangers are widely used in industrial app lications such as power sector, nuclear power generation, food processing plants, heat recovery systems, refrigeration, food industry, industrial HVACs etc. Convective heat transfer between a surface and the surrounding fluid in a heat exchanger has been a major issue and a topic of study in the recent years. In this particular study, an attempt has been made to analyze the effect of mass flow rate from a three different cross - sections on the helical tube, where the hot fluid flowing in tube and outer surfa ce of tube having less temperature then hot fluid. Different cross - sections of the pipes are taken into consideration while running the analysis. The contours of pressure, temperature, velocity magnitude and the mass transfer rate from the tubes were calcu lated and plotted using ANSYS FLUENT 14.5 where the governing equations of mass, momentum and energy transfer were solved simultaneously, using the k - ? two equations turbulence model. The fluid flowing through the tube was taken as water.