Thermodynamic and geometrical characteristics of mixed convection heat transfer in the shell and coil tube heat exchanger with baffles

The article presents passive heat transfer enhancement method in the form of baffles to increase the energy efficiency of the shell coil heat exchanger. Conducted literature review shows that, despite numerous studies, there is little work on the intensification of heat transfer at the shell side. Most of the work focuses on the impact of geometrical parameters of the coil itself. This article successfully proves that it is possible to increase the efficiency of heat exchange in the heat exchanger shell type coil with baffle inserts. This work shows that, due to the presence of mixed convection, natural convection has a significant effect for small values of Reynolds numbers and large heat flux. Also, the baffle and inlet configuration have a high impact on results. Presented simple experimental correlation gives a satisfactory compliance with experimental results. It should be noted that the correlation can be applied for all of the presented heat exchanger configurations. (C) 2017 Elsevier Ltd. All rights reserved.