Study of Flow and Heat Transfer Characteristics of Air Bubbles with Water Impinging Jet
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Abstract
In this research, the effect of air bubble addition on the heat transfer enhancement of a water impinging jet was investigated on a submerged smooth surface. The parameters for Reynolds number of water is 2.4 x 104, the ratio between the volumetric flow rate of the air to the total volumetric flow rate of 0.0 and 0.1 and the distance from the jet exit to the impingement surface at L = 2D, 4D, 6D, 8D and 10D were studied. The behaviour of air bubbles in a water jet was visualized using a high-speed camera. The heat transfer on the impingement surface was measured with a thermal imaging camera. According to the results, the air addition at the ratio between the volumetric airflow rate and the total volumetric flow rate was 0.1 for the impingement distance at L = 2D, 4D, 6D, 8D and 10D can increase the average Nusselt number along radial direction about 27.27%, 1.98%, 24.37%, 3.84% and 8.10%, respectively, compared to the case of the pure water jet. This is caused by the behaviour of small air bubbles that coalesce to form large bubbles and then impinged against the surface and small air bubbles that impinge on the surface and disturb the thermal boundary layer.
Article Details
วารสารวิศวกรรมฟาร์มและเทคโนโลยีควบคุมอัตโนมัติ (FEAT Journal) มีกําหนดออกเป็นราย 6 เดือน คือ มกราคม - มิถุนายน และกรกฎาคม - ธันวาคม ของทุกปี จัดพิมพ์โดยกลุ่มวิจัยวิศวกรรมฟาร์มและเทคโนโลยีควบคุมอัตโนมัติ คณะวิศวกรรมศาสตร์มหาวิทยาลัยขอนแก่น เพื่อเป็นการส่งเสริมและเผยแพร่ความรู้ ผลงานทางวิชาการ งานวิจัยทางด้านวิศวกรรมศาสตร์และเทคโนโลยีพร้อมทั้งยังจัดส่ง เผยแพร่ตามสถาบันการศึกษาต่างๆ ในประเทศด้วย บทความที่ตีพิมพ์ลงในวารสาร FEAT ทุกบทความนั้นจะต้องผ่านความเห็นชอบจากผู้ทรงคุณวุฒิในสาขาที่เกี่ยวข้องและสงวนสิทธิ์ ตาม พ.ร.บ. ลิขสิทธิ์ พ.ศ. 2535
References
Yeh LT. Review of heat transfer technologies in electronic equipment. Journal of Electronic Packaging. 1995; 117(4): 333-9.
Mudawar I. Assessment of high-heat-flux thermal management schemes, IEEE Transaction on Components and Packaging Technologies. 2001; 24 (2): 122–41.
Polat S. Heat and mass transfer in impingement drying, Drying Technology. 1993; 11(6): 1147–76.
Viskanta R. Heat transfer to impinging isothermal gas and flame jets, Experimental Thermal and Fluid Science. 1993; 6(2): 111–34.
Han B, Goldstein RJ. Jet-impingement heat transfer in gas turbine systems. Annals of the New York Academy of Sciences. 2001; 934(1): 147–61.
Zuckerman N and Lior N. Jet impingement heat transfer: physics, correlations and numerical modeling. Advances in Heat Transfer. 2006; 39: 565–631.
Barewar SD, Tawri S, Chougule SS. Heat transfer characteristics of free nanofluid impinging jet on flat surface with different jet to plate distance: An experimental investigation. Chemical Engineering & Processing: Process Intensification. 2019; 136: 1-10.
Donoghue DB, Albadawi A, Delauré, YMC, Robinson AJ, Murray DB. Bubble impingement and the mechanisms of heat transfer. International Journal of Heat and Mass Transfer. 2014; 71: 439-50.
Donoghue DB, Albadawi A, Delauré YMC, Robinson AJ, Murray DB. Mechanisms of heat transfer for axisymmetric bubble impingement and rebound. Heat and Mass Transfer. 2018; 54: 2559-70.
Choo K, Kim SJ. Heat transfer and fluid flow characteristics of two-phase impinging jets. International Journal of Heat and Mass Transfer. 2010; 53: 5692-9.
Fredrich BK, Glaspell AW, Choo K. The effect of volumetric quality on heat transfer and fluid flow characteristics of air-assistant jet impingement. International Journal of Heat and Mass Transfer. 2016; 101: 261-6.
Faghri A, Zhang Y. Two-phase flow and heat transfer. Transport Phenomena in Multiphase Systems. 2006; 853-949.
Glaspell AW, Rouse VJ, Friedrich BK, Choo K. Heat transfer and hydrodynamics of air assisted free water jet impingement at low nozzle-to-surface distances. International Journal of Heat and Mass Transfer. 2019; 132: 138–42.
Baghel BK, Sridharan A, Murallidharan JS. Heat transfer characteristics of free surface water jet impingement on a curved surface. International Journal of Heat and Mass Transfer. 2021; 164: 120487.
Alnak CDE, Varol Y, Firat M, Oztop HF, Ozalp C. Experimental and numerical investigation of impinged water jet effects on heated cylinders for convective heat transfer. International Journal of Thermal Sciences. 2019; 135: 493–508.
Aroonrujiphan C, Nuntadusit C. Flow and Heat Transfer Characteristics of Impinging Bubbly Jet. Journal of Advance Research in Fluid Mechanics and Thermal Sciences. 2020; 74(1): 68–80.
Cengel YA, Ghajar AJ. Heat and Mass Transfer: Fundamentals and Applications. Natural Convection. 2015; 533-5.