Turbulent Forced Convection and Entropy Generation of ‎Impinging Jets of Water-Al۲O۳ Nanofluid on Heated Blocks

A computational analysis on water-Al۲O۳ nanofluid turbulent forced convection is performed to analyze heat transfer and entropy production in a channel containing heated blocks, cooled by impinging jets. The two phase mixture model (TPMM) is used. The increase in the Reynolds number (Re) and the volume fraction of nanoparticles (φ), the decrease in spacing between the heated block (Db) and moving the location of the second jet (J۲) to the first jet (J۱) contribute to increasing the heat transfer rate (HTR).In addition, the TPMM gives higher values of average Nusselt number (Nu) ̅ than the single-phase model (SPM). The thermal (𝑆𝑔̇ ,𝑡ℎ), frictional (𝑆𝑔̇ ,𝜈) and total (𝑆𝑔̇ ,𝑡) entropy generation values increase with Re and φ. When Db is reduced, 𝑆𝑔̇,𝑡 increases. However, 𝑆𝑔̇ ,𝑡 increases when the jet position vary from J۲ to J۱. Different correlations are proposed for Nu ̅. Our results are compared with data available in the literature.

کلیدواژه ها:

heat transfer ، Turbulent Flow ، Entropy generation ، Nanofluid ، impinging jets ، heated blocks‎