Paper Details

Heat Exchangers are of utmost industrial importance in the field of Power generation, Refrigeration, AirConditioning, Nuclear energy and numerous other applications. However it is required to utilize the heat energy of thehot fluid to the optimum extent in order to come up with much more efficient energy systems. The classic design of a heatexchangers mainly consists of a shell and tube. The tube is enclosed within the shell and generally caries the hot fluid.The shell carries the cold fluid. There are various flow arrangements that can facilitate enhanced heat transfer. Howeverby continuous research, it was found that straight tube heat exchangers were not providing the required cooling effectto the desired e x t e n t . This has led to the development of Helical coil Heat exchangers in which, instead of astraight tube, a helical tube is used. The heat transfer analysis in helical coil heat exchangers is the next step towardsperformance evaluation and optimization of the system. This can be accomplished in two ways. One beingexperimentation and the other being numerical estimation by means of Computational Fluid Dynamics (CFD). Thiswork elaborates the methodology undertaken in experimentation as well as the analysis done by means of CFDconsidering three cases. The experimental procedure comprises of making the fluid to flow at various mass flow rates andobtaining the heat transfer characteristics. However the experimental results are prone to a certain external factors thatcan affect the results. This limitation can be overcome by using CFD where everything is pre-programmed andsolutions totally depend on the mathematical models and equations. Further the same model is developed usingsuitable software and the fluid flow simulation is carried out. Various boundary conditions like temperature, heat fluxand other temperature dependent thermal and transport properties are well defined during the pre processingstage. Solutions are carried out to obtain the results of simulation. The chief objective is to establish a correlationbetween the experimental results and the CFD results. On obtaining the results, critical comparison is done with regardsto the corresponding results obtained from experimentation and CFD. Thus we can look at CFD as an excellent tool toanalyze fluid flow systems with lesser investment as compared to experimentation. Since the fluid flow through theHelical coil Heat exchangers has got complex flow characteristics, there may be certain areas where CFD can provideresults that have got much more realistic values. At the end a conclusion is drawn as to which method of analysis canprove to be handy as well as reliable since the areas in which Helical Coil heat exchangers are used now a days are ofextreme technical importance.

Naveen Kumar Sahu, Prof. Jyoti Kale, “A Review of Comparative Study of Heat Transfer by Experimentation and CFD for Helical Coiled Heat Exchangers”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 12, pp. 52-63, December 2017.