Abstract
The paper presents the effect of the Reynolds number, relative roughness height and relative roughness pitch on the heat transfer and pressure loss in a solar air heater. A novel absorber plate with metal shavings from the turning of a steel shaft is employed to reduce the cost of production and to be available for the manufacturing industry. The parameters studied ranged from 5000 to 25000 for the Reynolds number, from 4.7 to 9.4 for the relative roughness pitch (P/e) and from 0.26 to 0.43 for the relative roughness height (e/Dh). The results show that there are some characteristics that differ from the published studies. The optimum e/Dh is 0.35 to obtain the highest thermo-hydraulic performance parameter, and the parameter increases with a decrease in P/e. Within the scope of the study, the maximum thermo-hydraulic performance parameter is approximately 1.5. The correlations between the Nusselt number and the friction factor are developed based on the experimental data. The results from the correlations and from the experimental data are fairly in agreement.
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This research is funded by the Vietnam National University Ho Chi Minh City (VNU-HCM) under grant number C2018-20-02.
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Recommended by Associate Editor Youngsuk Nam
Nguyen Minh Phu received B.E. in 2006, and M.E. in 2009 from Ho Chi Minh City University of Technology (HCMUT), Vietnam, and Ph.D. from University of Ulsan, Korea in 2012. He had been with the Arizona State University at Tempe during the summer 2014 as exchange visitor. He has been a lecturer of Mechanical Engineering Faculty in HCMUT since 2006. His research interests include the design of thermal systems, the applied renewable energy and the CFD.
Vo Tuyen obtained his Ph.D. degree from Ho Chi Minh City University of Technology in 2014. He is currently serving as a Vice-rector of Ho Chi Minh city University of Food Industry (HUFI). His research interests include manufacturing engineering and turbulent two-phase flow.
Tu Thien Ngo received B.E. in 2012, and M.E. in 2014 from Ho Chi Minh City University of Technology (HCMUT), Vietnam, and Ph.D. from University of Ulsan, Korea in 2019. He has been a lecturer of Mechanical Engineering Faculty in HCMUT since 2013. His research interests include the CFD and the combustion.
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Phu, N.M., Tuyen, V. & Ngo, T.T. Augmented heat transfer and friction investigations in solar air heater artificially roughened with metal shavings. J Mech Sci Technol 33, 3521–3529 (2019). https://doi.org/10.1007/s12206-019-0646-x
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DOI: https://doi.org/10.1007/s12206-019-0646-x