tailieunhanh - Enhancement of efficacy and heat transfer characteristics of Tio2 nano fluids under turbulent flow conditions in parabolic trough solar collector

The convective heat transfer coefficient was improved up to by using TiO2 nanofluids instead of the base fluid. It was found that TiO2 nanofluid with a volume fraction of (at a mass flow rate of kg/s) will provide the maximum efficiency enhancement in the PTSC ( higher than the water-based collector). Consequently, the absorbed energy parameter was found to be greater than that of the base fluid. | Enhancement of efficacy and heat transfer characteristics of Tio2 nano fluids under turbulent flow conditions in parabolic trough solar collector International Journal of Mechanical Engineering and Technology IJMET Volume 11 Issue 03 March 2020 pp. 68-79. Article ID IJMET_11_03_007 Available online at http ijmet JType IJMET amp VType 11 amp IType 3 ISSN Print 0976-6340 and ISSN Online 0976-6359 IAEME Publication ENHANCEMENT OF EFFICACY AND HEAT TRANSFER CHARACTERISTICS OF TIO2 NANO FLUIDS UNDER TURBULENT FLOW CONDITIONS IN PARABOLIC TROUGH SOLAR COLLECTOR Kumar Professor Department of Mechanical Engineering Lakireddy Bali Reddy college of Engineering Rao Professor Department of Mechanical Engineering VVIT Namburu Student Department of Mechanical Engineering Lakireddy Bali Reddy college of Engineering Reddy Student Department of Mechanical Engineering Lakireddy Bali Reddy college of Engineering ABSTRACT The efficacy of a parabolic trough solar collector PTSC was improved by using TiO2 DI-H2O De-Ionized water nanofluid. Working samples consisting of nanofluids with concentrations of and were compared with deionized water the base fluid at different flow rates under turbulent flow regimes 2850 Re 7440 . The experiments were designed as per ASHRAE 93 2010 standards. Heat transfer and the flow characteristics of nanofluids through the collector were studied and empirical correlations were developed in terms of the Nusselt number friction factor and performance index. The convective heat transfer coefficient was improved up to by using TiO2 nanofluids instead of the base fluid. It was found that TiO2 nanofluid with a volume fraction of at a mass flow rate of kg s will provide the maximum efficiency enhancement in the PTSC higher than the water-based collector . Consequently the absorbed energy parameter was found to be greater than that of the base fluid. .