RT Journal Article
ID 496766070f6eb86c
A1 Cramer, L.
A1 Mahmood, Gazi
A1 Meyer, Josua Petrus
T1 THERMOHYDRAULIC PERFORMANCE OF A CHANNEL EMPLOYING WAVY POROUS SCREENS
JF Heat Transfer Research
JO HTR
YR 2018
FD 2018-09-12
VO 49
IS 18
SP 1867
OP 1883
K1 friction factor ratio
K1 Nusselt number ratio
K1 thermal performance
K1 porosity
K1 wave period
AB Porous inserts are commonly employed in the heat exchanger channels to enhance the thermal performance. The present
experimental investigations measure the pressure drop and heat transfer in a rectangular channel that employs a sinusoidally shaped porous screen mesh as inserts. Four screens with different forms of sinusoidal wave are employed: 68% porosity–12-mm period, 48% porosity–12-mm period, 68% porosity–18-mm period, and 48% porosity–18-mm period. The peak-to-peak height of the wave is 5 mm and touches the channel walls along the wave vectors that are parallel to the mean flow. Measurements in the smooth channel are used to normalize the friction factors and Nusselt numbers in the screen channel and provide the enhancements of friction factors f/f0 and Nusselt numbers Nu/Nu0 due to the screens. The Reynolds number Re based on the channel hydraulic diameter varies between 400 and 11,000. The results indicate that the friction factor f, average Nusselt number Nu, Nu/Nu0, and f/f0 in the screen channel depend strongly on Re. The screen porosity and wave period effects are significant on the f and f/f0 only. The thermal performance index, (Nu/Nu0)/(f/f0)(1/3), is also influenced strongly by Re. The present results thus indicate the viability of the wavy porous inserts for heat exchangers.
PB Begell House
LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,38ea29f07a631486,496766070f6eb86c.html