Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 68, Issue -, Pages 268-275Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2015.04.009
Keywords
Heat transfer coefficient; Pressure drop; Nusselt number; Friction factor; Surface roughness
Funding
- Thailand Research Fund
- South East Asia University
- Research Chair Grant National Science and Technology Development Agency (NSTDA)
- National Research University Project
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Experimental data regarding heat transfer coefficient and pressure drop of water flow inside a plate heat exchanger with a rough surface is investigated and compared with that obtained from a smooth surface. Three commercial stainless steel corrugated plates with symmetrical chevron angle of 25 degrees are used. The water flow inside the plate heat exchanger is arranged for a single pass and counter flow. The test runs are performed at Reynolds numbers ranging between 1300 and 3200 and plate surface roughness ranging between 0.936 mu m and 3.312 mu m. The experimental results show that increase in surface roughness yields an increase in heat transfer coefficient between 4.46% and 17.95% and an increase in pressure drop between 3.90% and 19.24% with respect to a smooth surface. The correlations for predicting the Nusselt number and friction factor of water flow inside a plate heat exchanger with a rough surface are proposed. (C) 2015 Elsevier Inc. All rights reserved.
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