TY - JOUR

T1 - The single-blow transient testing technique for offset and wavy fins of compact plate-fin heat exchangers

AU - Ranganayakulu, C.

AU - Luo, Xing

AU - Kabelac, Stephan

N1 - Funding information: The research visits of the first author C. Ranganayakulu to the Helmut Schmidt University, Hamburg and Leibniz University, Hannover were financed by Alexander von Humboldt Foundation, Germany. The authors acknowledges the use of single-blow test apparatus at Institute for Thermodynamics, Helmut Schmidt University, Hamburg, Germany.

PY - 2017/1/25

Y1 - 2017/1/25

N2 - A single-blow transient test technique is employed to measure the Colburn j factor versus Reynolds number characteristics of high efficiency compact heat exchanger surfaces having offset and wavy fins. Using the experimental data, the NTU values are estimated for 5 types of fins. The measured data is evaluated using the maximum slope method to obtain the corresponding heat transfer coefficient in terms of Colburn j factor, and then is compared with the available correlations of theoretical steady state CFD model. In this analysis, the effects of non-adiabatic side walls and longitudinal heat conduction on the exit fluid temperature response and NTU values are discussed. The test core pressure drops are also measured, and the pressure drop components of entrance, acceleration, core friction and exit losses are compared with the CFD results.

AB - A single-blow transient test technique is employed to measure the Colburn j factor versus Reynolds number characteristics of high efficiency compact heat exchanger surfaces having offset and wavy fins. Using the experimental data, the NTU values are estimated for 5 types of fins. The measured data is evaluated using the maximum slope method to obtain the corresponding heat transfer coefficient in terms of Colburn j factor, and then is compared with the available correlations of theoretical steady state CFD model. In this analysis, the effects of non-adiabatic side walls and longitudinal heat conduction on the exit fluid temperature response and NTU values are discussed. The test core pressure drops are also measured, and the pressure drop components of entrance, acceleration, core friction and exit losses are compared with the CFD results.

KW - CFD

KW - Colburn j factor

KW - Compact heat exchangers

KW - Pressure drop

KW - Single-blow testing technique

KW - Wavy and offset fins

UR - http://www.scopus.com/inward/record.url?scp=84969920254&partnerID=8YFLogxK

U2 - 10.1016/j.applthermaleng.2016.05.118

DO - 10.1016/j.applthermaleng.2016.05.118

M3 - Article

AN - SCOPUS:84969920254

VL - 111

SP - 1588

EP - 1595

JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

ER -