REVIEW PAPER – THE EFFECT OF INTERNALLY HELICALLY RIBBED TUBES ON THE HEAT TRANSFER COEFFICIENT AND FRICTION FACTOR

This paper presents enhancing the heat transfer for the fluid flow the internally helically ribbed tubes because of extended geometry by increasing the convective heat transfer coefficient as compared to smooth tubes. Due to the presence of ribs inside the tube the friction factor has increased because of increase in the surface contact area between the fluid and solid material. The extended ribbed surface changes the flow direction of fluid to turbulent even at low Reynolds number. Due to the presence of ribs inside the tube or an extended surface it becomes difficult to find the heat transfer coefficient analytically. Therefore the experiments are carried out to determine the heat transfer coefficient for internal helical ribs presents inside the tube. Therefore various authors' puts forward for modelling thermal and flow conditions in internal ribbed tubes.