限界液膜厚さ概念を考慮した環状流領域・限界熱流束の計算

概要

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In the particular region of annular flow that is encountered with short tubes and accordingly with high values of critical heat flux (CHF), the prediction of CHF based on the annular flow hydrodynamic model exhibits a character quite different from that of experimental data. If the concept of the critical liquid film thickness, which has recently been proposed as the governing factor of CHF in external flow-type boiling, is introduced to the foregoing conventional model, CHF can be predicted very naturally through the wholw range of annular flow. This fact is shown quantitatively in this paper by employing the Levy hydrodynamic model. The calculation of CHF has been made under very wide conditions of tube diameter, tube length, and mass velocity for water at 6.9, 2.95, and 0.84 MPa. Only the results obtained for 6.9 MPa are presented in the paper because of the similarity of results for the three different pressures.
一般社団法人日本機械学会の論文
1984-03-28