Three-Dimensional Heat Transfer of A Confined Circular Impinging Jet With Buoyancy Effects  

Oleh:

Ichimiya, Koichi ; Yamada, Yoshio

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 125 no. 2 (Apr. 2003), page 250-256.
Topik: jets; three - dimensional; heat transfer; confined circular; impinging jet; bouyancy effects

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.6 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This paper describes the heat transfer and flow characteristics of a single circular laminar impinging jet including buoyancy force in a comparatively narrow space with a confined wall. Temperature distribution and velocity vectors in the space were obtained numerically by solving three - dimensional governing equations for the Reynolds number Re (= u(m) D / v) = 400 – 2000 and the dimensionless space, H (= h / D) = 0.25 – 1.0. After impingement, heat transfer behaviour on the impingement surface is divided into a forced convection region, a mixed convection region, and a natural convection region in the radial direction. The local heat flux corresponding to these three regions was visualized using a thermosensitive liquid crystal. Moreover, with the increase in Reynolds number, Re, and dimensionless space, H, the recirculation flow on the impingement surface moves downstream and its volume increases correspondingly. The Nusselt number averaged from r = 0 to the minimum point of peripherally averaged Nusselt number, Num, was evaluated as a function of Re and H.

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