Effects of Grashof Number and Prandtl Number on Heat Transfer of a Single Circular Impinging Jet with Confined Wall

• ICHIMIYA Koichi

  Department of Mechanical System Engineering, Faculty of Engineering, Yamanashi University

• MATSUMOTO Hiroshi

  Kyusyu Electric Ltd.

• FUKUMOTO Hiromichi

  Maekawa Ltd.

• MIYAZAWA Toshiyoshi

  Department of Mechanical System Engineering, Faculty of Engineering, Yamanashi University

Bibliographic Information

Other Title

• 単一円形衝突噴流熱伝達に及ぼすグラスホフ数およびプラントル数の影響
• タンイツ エンケイ ショウトツ フンリュウ ネツ デンタツ ニ オヨボス グラ

Abstract

The numerical estimation was performed on the effects of Grashof number and Prandtl number in a single circular impinging jet with confined insulated wall. Numerical values were obtained for the Reynolds number Re = 100 and 500, the Prandtl number Pr = 0.01 ∼ 1,000, the Grashof number Gr = O∼10,000 and the dimensionless distance between nozzle and impingement surface H=1.0. In the case of a normal jet, a recirculated flow was generated on the insulated upper wall and the local heat transfer was improved with increase of Grashof numbers because of a flow accerelation near the impingement surface. However, in the case of a jet inverse to gravity direction, the local heat transfer was depressed because a recirculated flow region by the buoyancy was generated on the impingement surface. Effects of Prandtl number were also examined. The characteristics of average Nusselt numbers along various Prandtl numbers were divided into three regions.

Journal

• Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers

  Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 14 (2), 169-177, 1997

  Japan Society of Refrigerating and Air Conditioning Engineers

Keywords

• Thermal Engineering
• Combined Natural and Forced Convection
• Circular Impinging Jet
• Laminar Flow
• Grashof Number
• Prandtl Number
• Numerical Calculation

Details

• CRID: 1390001204665654912
• NII Article ID: 10002714105
• NII Book ID: AA11125910
• DOI: 10.11322/tjsrae.14.169
• ISSN: 2185789X
• ISSN: 13444905
• NDL BIB ID: 4275424
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4275424
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed