Review of heat transfer enhancement on helical coil heat exchanger by additive passive method

Behaviour of a Non-Newtonian Fluid in a Helical Tube Under the Influence of Thermal Buoyancy

“…Because this type of tube is very important in thermal applications, several new works have been published on this topic to explain the scientific view on it [29][30][31][32][33][34][35]. In general, the main objective of these studies is to research the geometrical shape that increases the value of heat transfer.…”

Experimental investigation of performance improvement of double-pipe heat exchangers with novel perforated elliptic turbulators

“…They have many advantages compared to active methods such as their relative simplicity, lower manufacturing costs and lower maintenance and repair costs [1][2][3]. In passive techniques increasing turbulence in the flow is the key aspect of heat transfer improvements, while the pressure drop or friction factor usually retains at a lower possible level.…”