Marathwada Mitra Mandal's Institute of Technology, Lohegaon, Pune, India
Online published on 27 July, 2015.
The enhancements of heat transfer characteristics in a uniform heat flux circular tube fitted with inserts creating annular blockages are experimentally investigated in this paper. This paper, is outcome of experimental study conducted to compare the rate of heat transfer with annular blockages in a tube. Blockages are created by using insert rings of aluminum of various inner diameter creating 22%, 44% 48% and 64% of blockage in tne tube. It is found that each application of the % blockages can help to increase considerably the heat transfer rate over that of the plain tube by about 278% and 206%, respectively. Nusselt number, Heat transfer raet, Reynolds number are determined with the experimental data. It was found that the use of the annular blockage of 48% leads to a maximum heat transfer rate that is up by 316%. Whereas on increasing the blockage upto 64% the heat transfer rate goes on reducing.
