旋回ガス流伝熱面の研究

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タイトル別名
  • Experimental Research on Swirl Gas-Flow Heating Surface
  • センカイ ガスリュウ デンネツメン ノ ケンキュウ

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A new type of heating surface, which is composed of swirl gas-flow nozzle at the entrance and single or double tube coils concentrically situated in the swirling gas flow, is introduced here. The features of this type are that, by changing the nozzle angle, the gas speed can be controlled indifferently to volumetric gas flow quantity, and that tubing does not need to be bend sharply. Several typical models of this heating surface system have been tested by a fundamental experimental set with electrically heated wire-coils and cooling air. The approximate relation between the Nusset number Nu and Reynolds number Re of tube is thus known to be : [numerical formula] where L, D0 are coil acial length and cylinder-diameter respectively and c is a constant changed by nozzle shape and nozzle exist angles. On the newly designed super-charged super-critical monotube boiler, two heating surfaces of this type were tried ; and their performance are reported here.

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