Heat transfer enhancement and pressure drop studies in horizontal and vertical helically coiled heat exchanger using nanofluids

Abstract

Heat transfer in curved and helical circular tubes has been the subject of several studies and it has been widely reported in literature that heat transfer rates in helical coils are higher as compared to a straight tube. These heat exchangers are widely used in different industrial applications such as power generation, nuclear industry, process plants, heat recovery systems, refrigeration and food industry etc. The compactness and the high heat transfer performance are the main characteristics of coiled pipes. newlineIn spite of numerical and experimental studies that have been done in relation to tube-side heat transfer coefficient, there are not many investigations on shell-side mixed convection heat transfer coefficient of shell-and coil heat exchangers. Besides the performance of the heat exchanger being improved, the heat transfer enhancement enables the size of the heat exchanger to be considerably decreased. newlineThe enhancement newline