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傳熱薄壁物體存在條件探討

Discussion of the Existent Condition for Thermally Thin Wall Body

  • 摘要: 本文詳細分析了處于對流換熱環境下實際物體(厚壁物體,物體內溫度是時間、空間的函數)轉化為薄壁物體(溫度只是時間的函數)的條件。分析了目前各種作為薄壁物體判據的合理性與局限性,在此基礎上,提出了以物體內最大的無量綱溫度梯度小于某一常數作為薄壁物體的判據,并分析了Fo數與Bi數對這一判據的影響。

     

    Abstract: This paper discusses the conditions of translation from a thermally wall body into a thermally thin body, the former the temperature is both functions of time and space, the later the temperature is single function of time under connective heat tranfer circumstance. On the bases of analysing the reasonableness and limitation of all criteria of thin wall body at present, a new criterion of thin wall body has been developted, in which the largest dimensionless temperature gradient is considered less than a certain constant, and the effect of Fo and Bi numbers on the new criterion has also been demonstrated.

     

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