Heat transfer from a slot air jet impinging on a circular cylinder
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Heat transfer from a slot air jet impinging on a circular cylinder. / Olsson, E. E.M.; Ahrné, L. M.; Trägårdh, A. C.
I: Journal of Food Engineering, Bind 63, Nr. 4, 2004, s. 393-401.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Heat transfer from a slot air jet impinging on a circular cylinder
AU - Olsson, E. E.M.
AU - Ahrné, L. M.
AU - Trägårdh, A. C.
PY - 2004
Y1 - 2004
N2 - Heat transfer from a slot air jet impinging on a cylinder shaped food product placed on a solid surface in a semi-confined area was investigated using computational fluid dynamics (CFD). Simulations of a cylinder in cross flow with the k-ε, k-ω and SST models in CFX 5.5 were compared with measurements in the literature. The SST model predicts the heat transfer better than the other models and is therefore used in this study. The distribution of the local Nusselt numbers around the cylinder for various Reynolds numbers (23,000-100,000), jet-to-cylinder distances, H/d (2-8), and cylinder curvature, d/D (0.29-1.14) was determined. The results show that the local Nusselt numbers varies around the surface of the cylinder and that the average Nusselt number and the stagnation point Nusselt number increases with increasing Reynolds numbers and surface curvature but has little dependency on the jet-to-cylinder distance. The result is Num=0.14Re0.65(H/d) -0.077(d/D)0.32 and Nus=0.46Re 0.59(H/d)-0.026(d/D)0.32.
AB - Heat transfer from a slot air jet impinging on a cylinder shaped food product placed on a solid surface in a semi-confined area was investigated using computational fluid dynamics (CFD). Simulations of a cylinder in cross flow with the k-ε, k-ω and SST models in CFX 5.5 were compared with measurements in the literature. The SST model predicts the heat transfer better than the other models and is therefore used in this study. The distribution of the local Nusselt numbers around the cylinder for various Reynolds numbers (23,000-100,000), jet-to-cylinder distances, H/d (2-8), and cylinder curvature, d/D (0.29-1.14) was determined. The results show that the local Nusselt numbers varies around the surface of the cylinder and that the average Nusselt number and the stagnation point Nusselt number increases with increasing Reynolds numbers and surface curvature but has little dependency on the jet-to-cylinder distance. The result is Num=0.14Re0.65(H/d) -0.077(d/D)0.32 and Nus=0.46Re 0.59(H/d)-0.026(d/D)0.32.
KW - CFD
KW - Cooling
KW - Cylinder
KW - Food
KW - Jet impingement heat transfer
KW - Nusselt number
KW - SST
U2 - 10.1016/j.jfoodeng.2003.08.009
DO - 10.1016/j.jfoodeng.2003.08.009
M3 - Journal article
AN - SCOPUS:1242331414
VL - 63
SP - 393
EP - 401
JO - Journal of Food Engineering
JF - Journal of Food Engineering
SN - 0260-8774
IS - 4
ER -
ID: 202134727