Experimental and numerical study of fluid flow and heat transfer in the impinging of inline round jets

Year 2025, Volume: 11 Issue: 1, 270 - 289, 31.01.2025

B. Venkata Sai Raghu Vamsi P. Raveendiran Malladi R. Ch. Sastry

Abstract

The effect of pitch-to-diameter ratio, dimensionless nozzle-to-plate spacing, and Reynold’s number on fluid flow behavior and heat transfer from the heated surface is studied numerically for three inline circular impinging jets. The dimensionless nozzle to distance varies from 1 to 6, the pitch-to-diameter ratio from 2 to 4, and Reynold’s number from 3512.69 to 9532.71. The streak lines plotted numerically are validated by experiments using the Oil flow visualization technique. As the inter-jet spacing increases, a shift in the direction of the resultant fluid flow on the target surface is observed with a symmetrical distribution of fluid flow and heat transfer at P/D=4.Correlations for the maximum static pressure, maximum coefficient of pressure, and average Nusselt number on the target surface are proposed by performing regression analysis at a confidence level of 98% with an R2 value of 99.53%, 99.60%, and 99.21%, respectively. In addition, it has been observed that the jet-to-jet distance, distance between the nozzle and target plate, and Reynold›s number play a crucial role in the augmentation of heat transfer and distribution of air in the multiple impinging jets.

Keywords

Multiple Impinging Jets, Nusselt Number, Pressure Coefficient, SST K-Ω, Static Pressure, Streak Line Visualization

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