C-RISE Lecture Series
The heat transfer to boiling liquids in a reboiler tube generates a changing two-phase flow with various flow regimes spread along the tube length. The point at which the two-phase begins is known as the incipient point of boiling (IPB)., which corresponds to the conditions of minimum degree of superheat or heat flux required for the formation and detachment of the first vapour bubble from the heated surface. Since IBP divides the tube in two distinct regions, nonboiling single phase and boiling two phases with entirely different modes of heat transfer, its prediction is very important in the design of two phase heat transfer equipment. In the present study an analysis has been carried out to predict the boiling incipience with natural circulation flow in a reboiler tube. An empirical model has been proposed to predict the wall superheat required for onset of boiling of liquids covering a wide range of thermo physical properties in a vertical thermosiphon reboiler.This approach utilizes physical parameters of commonly accepted incipience models and takes into account the effect of submergence. The results predicted from the theoretical analysis were found to be consistent with the experimental data, having average absolute relative error of 15. 0 percent.
Prof. Mohammad Kamil is presently the Professor and Chairman of the Petroleum Studies Department, Z.H. College of Engineering and Technology, A.M.U. Aligarh. He received his B.Sc. Eng (Chemical) degree from AMU Aligarh, M. Tech from Indian Institute of Technology, Roorkee, India and his Ph.D. from AMU Aligarh in 1993. His research mainly focuses on heat transfer in two-phase flow, natural flow boiling, Petroleum Processing, modelling and simulation and polymer surfactant interactions. He has published over 140 articles in the International and National journals and conference proceedings. He has been on the organizing committee for several international and national conferences. He has received the outstanding awards in academia and presently working as Chairman the Institution of Engineers (India), ALC Aligarh, India.