Convective heat transfer enhancement of graphite nanofluids in shell and tube heat exchanger

摘要

For the heat transfer to be large, the heat transfer area should be large. However by using nanofluids as the working fluid, the required heat transfer can be achieved by using the same apparatus. Current research suggests a promising future for graphite nanofluids. The main focus of this research ison developing higher convective heat transfer behavior of graphite nanofluids through the shell andtube heat exchanger under laminar flow.Graphite nanopowder is brought in the market and is dispersed in the base fluid (water) by varying its concentration such as 0.025%, 0.05%, 0.075%. The temperature of the hot and the cold fluid is noted down for each concentration. Keeping the flow rate of the hotter fluid as constant, flow rate of the colder fluid is varied. Also the effect of the flow rate and concentration on the heat transfer co-efficient has been discussed. It has been found that when the concentration of the graphite is increased, the heat transfer co-efficient increases gradually as the concentration increases.