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Evaluation des caractéristiques de transfert de chaleur d'une ailette sous des conditions humides.

Estimation of heat-transfer characteristics on a fin under wet conditions.

Auteurs : CHEN H. T., WANG H. C.

Type d'article : Article

Résumé

The finite difference method in conjunction with the least-squares scheme and experimental temperature data is proposed to solve the one-dimensional (1-D) and two-dimensional (2-D) inverse heat conduction problems in order to predict the average overall heat-transfer coefficient on a fin and wet fin efficiency for various air speeds under wet conditions. The sensitive and overall heat-transfer coefficients on the fin, the Lewis number and the functional form between the relative humidity and fin temperature are unknown a priori in this study. In addition, the sensitive and overall heat-transfer coefficients on the fin are also assumed to be non-uniform. Thus the whole fin is divided into several sub-fin regions in order to predict the heat-transfer coefficient and fin efficiency values. Variations of these two predicted values with the relative humidity (RH) for various air speeds can be obtained using the present inverse scheme in conjunction with measured fin temperatures. In order to validate the accuracy and reliability of the present inverse scheme, a comparison between the present estimates obtained from the 1-D and 2-D models and exact values is made using simulated temperature data. The results show that the present estimates of the heat-transfer coefficient value obtained from the 1-D and 2-D models agree well with the exact values even for the case with the measurement errors. Variations of the heat-transfer coefficient and fin efficiency values obtained from 2-D model with the RH value are similar to those obtained from 1-D model for various air speeds. However, the present estimates of the heat-transfer coefficient and fin efficiency values obtained from the 2-D model an slightly deviate from those obtained from the 1-D model. It is worth mentioning that the deviation between the heat-transfer coefficient value in the downstream region and that in the upstream region can be observed using the 2-D model. This phenomenon cannot be obtained from the 1-D model. [Reprinted with permission from Elsevier. Copyright, 2007].

Détails

  • Titre original : Estimation of heat-transfer characteristics on a fin under wet conditions.
  • Identifiant de la fiche : 2008-2041
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 51 - n. 9-10
  • Date d'édition : 05/2008

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