Effects of Inclined Inlet and Outlet Ports in Jet Arrays
Open Access
- Author:
- Sill, Patrick
- Graduate Program:
- Mechanical Engineering
- Degree:
- Master of Science
- Document Type:
- Master Thesis
- Date of Defense:
- February 17, 2023
- Committee Members:
- Vahid Motevalli, Program Head/Chair
Brian Allen Maicke, Thesis Advisor/Co-Advisor
Anilchandra Attaluri, Committee Member
Rick Ciocci, Committee Member - Keywords:
- Jet Impingement
Thermal Management
Heat Transfer
Jet Array - Abstract:
- Jet impingement heat transfer is a promising method for managing the temperature of high-heat-flux devices, such as power electronics and turbines. The use of obliquely inclined inlet and outlet ports shows potential for reducing the pressure losses across the impingement region, in comparison to the typical orthogonal ports. Prior works on jet arrays with interspersed extraction ports have used ports which were orthogonal to the impinged plate. In the present study, obliquely oriented inlets and outlets were examined for their effects on heat transfer and pressure losses. A total of 50 simulations were studied. Parameters under study included Reynolds number (Re) from 125 to 500, jet outlet inclinations from 20 to 90 degrees, inlet inclinations from 30 to 90 degrees and jet-to-plate heights of 1, 2 and 4. Outlet ports with 45- degree inclinations resulted in a decreased pressure drop across the impingement zone compared to 90-degree outlets, with minor changes to the average Nusselt number (Nu). For example, in the case where Re=250 and H/W = 2, a 4% average Nu enhancement and 58% reduction in k were observed for the 45-degree outlet case compared to the 90-degree outlet initial case. Correlations were also proposed for k factors and average Nusselt numbers of arrays with inclined inlets.