An experimental investigation of turbulent flow heat transfer through tube with rod-pin insert

Abstract

An experimental investigation has been carried out to study the turbulent flow heat transfer and to determine the pressure drop
characteristics of air, flowing through a tube with insert. An insert of special geometry is used inside the tube. The test section is
electrically heated, and air is allowed to flow as the working fluid through the tube by means of a blower. Air velocity, air inlet
and outlet temperature, local wall temperature and the pressure drop are measured to determine the friction factor, the Nusselt
number, and the heat transfer coefficient. The same experiment is carried out to determine heat transfer through the same tube
without any insert. Comparing the results obtained from these two different sets of experiments, it is found that heat transfer
through tube can be enhanced by using inserts inside the tube up to 9.8 times than tube without insert.