Experimental Investigation of Heat Transfer Augmentation on Automobile Radiator operated with MWCNT Nanofluid by Axisymmetric Air Jet Impingement through Confined Channel
A typical radiator is a cross-flow fin-tube heat exchanger with coolant and water flowing inside the tube and ambient air taking out heat from the fin and tube surfaces. The major resistance to heat transfer in this configuration is offered
by the working fluid inside the tubes and the air-side heat
transfer co-efficient. The heat transfer ability of working fluid can be enhanced by adding high thermal conductive Nano
particles like Al2O3, CuO, Tio2, SiO2, Fe2O3, and Multi Wall Carbon Nano Tubes (MWCNT). The heat transfer coefficient on air side can be improved by Impinge air jets on the radiator. In the present investigation the base fluid is prepared by mixing 40% ethylene glycol and 60% distilled water. MWCNT nano particles of 36nm size are mixed with prepared base fluid varying from 0.2% to 0.8% volume concentration. The experimental set up consists of coolant storage tank, heater, a high temperature durable pump, a radiator, perforated plate and a fan. The perforations on the plate are axis symmetric and inline. A series of experiment are conducted by keeping perforated plate in between exhaust fan and radiator for different H/D ratios and in the range of Reynolds number from 1000 to 4000. The performance of radiator is analyzed for H/D ratios and mass flow rates of base fluid with and without MWCNT nano particles. The results are favorable with literature reported values. It is expected that this study which demonstrates the influence of impingement of jets and addition of MWCNT nano tubes in working fluid led to enhance heat transfer rate from working fluid, Our exploratory outcomes revealed that the average heat transfer coefficient is specifically corresponding to the volume concentration of nanofluids and Reynolds number. Also, the most extreme normal heat transfer coefficient upgrade was observed to be 40-48% for 0.6% nano particle volume concentration and at 65°c compared with base fluid. Increase in heat transfer coefficient on air side and improve the Maruthi Suzuki1000cc radiator performance.