Dry-Out Heat Fluxes of FAlling Film and Low-Mass Flux Upward-Flow in Heated Tubes.

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  • 垂直加熱管内流下液膜および低質量流量上昇流のドライアウト熱流束
  • スイチョク カネツカンナイ リュウカ エキマク オヨビ テイ シツリョウ リュ

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Abstract

Dry-out heat fluxes were investigated experimentally for a film flow falling down on the inner surface of vertical heated-tubes and for a low mass flux forced-upward flow in the tubes using R 113. This work followed the study on those for a two-phase natural circulation system. For the falling film boiling, flow state observation tests were also performed, where dry-patches appearing and disappearing repeatedly were observed near the exit end of the heated section at the dry-out heat flux conditions. Relation between the dry-out heat flux and the liquid film flow rate is analyzed. The dryout heat fluxes of the low mass flux upflow are experessed well by the correlation proposed in the previous work. The relation for the falling film boiling shows a similar trend to that for the upflow boiling, however, the dry-out heat fluxes of the falling film are much lower, approximately one third, than those of the upward flow.

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