Experimental Investigation of Local Heat Transfer Distribution on Smooth and Roughened Surfaces Under an Array of Angled Impinging Jets

Abstract

Measurements of the local heat transfer distribution on smooth and roughened surfaces under an array of angled impinging jets are presented. The test rig is designed to simulate impingement with crossflow in one direction. Jet angle is varied between 30, 60, and 90deg as measured from the target surface, which is either smooth or randomly roughened. Liquid crystal video thermography is used to capture surface temperature data at five different jet Reynolds numbers ranging between 15,000 and 35,000. The effect of jet angle, Reynolds number, gap, and surface roughness on heat transfer and pressure loss is determined along with the various interactions among these parameters.

Numerical predictions of jet impingement heat transfer on square pin-fin roughened plates

“…The computation results were validated with the present experimental data, and the published data from Xing et al [17] and El-Gabry et al [23] for the impingement on the flat plate at Reynolds numbers between 15,000 and 35,000. Both averaged and local Nusselt numbers were displayed in Figs.…”

Experimental and numerical investigation of impingement heat transfer on a flat and micro-rib roughened plate with different crossflow schemes

“…A case of the impingement on the flat plate is compared with literature data from Son et al [17], Park et al [37] and El-Gabry et al [19]. Fig.…”

“…They concluded that the roughness element blockage should be large for the best enhancement of heat transfer in the presence of crossflow. El-Gabry and Kaminski [19] presented the heat transfer distribution on flat and roughened surfaces under an array of angled impinging jets at the Reynolds number ranging from 15,000 to 35,000. The effect of randomly roughened surfaces on heat transfer was quantified.…”

Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

“…Figure 13 shows the local Nusselt number distributions on the target plate for a Reynolds number [16], and El-Gabry and Kaninski [25] and with a correlation presented by Florschuetz et al [26] for the maximum crossflow case. Figure 16 shows the comparison of the present data and the literature data.…”