Numerical and experimental investigation of the effect of micro restriction geometry on gas flows through a micro orifice

Aboubakri, Akam and Sadaghiani, Abdolali Khalili and Akgönül, Sarp and Erdoğmuş, Abdullah Berkan and Baki, Murat and Can, Fatih and Şabanoviç, Asif and Koşar, Ali (2022) Numerical and experimental investigation of the effect of micro restriction geometry on gas flows through a micro orifice. Fluids, 7 (5). ISSN 2311-5521

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Abstract

This study experimentally and numerically investigates the effects of the nozzle/needle distance (clearance) and supply pressure on single phase compressible gas flow in a micro orifice with needle restriction, which play important roles in many engineering applications such as cryogenic cooling and MEMS (microelectromechanical systems) device cooling. Nitrogen was used as the working fluid at supply pressures ranging from 10 to 50 bars, while the conical needle draft angle was 15◦. The nozzle/needle distance (clearance) was changed from 100 µm to 500 µm. From the experimental point of view, the load provided by the working fluid over the needle was measured by a load sensor. For the numerical analysis, six turbulence models and three wall treatments were considered in numerical simulations. The effect of micro restriction on high-pressure micro-gas flows was further assessed by numerical modeling. It is evident from the results that the utilized turbulence model has a considerable effect on the computed results. The k–ε standard and Spalart–Allmaras models were found to be not suitable for modeling micro-scale gas flows with restriction. On the other hand, the k–ε realizable and k–ω SST models exhibit the best performance in predicting the results.
Item Type: Article
Uncontrolled Keywords: enhanced wall function; Joule–Thomson effect; micro orifice; turbulent flow
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Abdolali Khalili Sadaghiani
Date Deposited: 22 Aug 2022 13:42
Last Modified: 04 Sep 2022 20:58
URI: https://research.sabanciuniv.edu/id/eprint/44166

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