化工学报 ›› 2011, Vol. 62 ›› Issue (S1): 130-133.

• 流体力学与传递现象 • 上一篇    下一篇

超声空化对换热器协同场的影响

张艾萍,谢立强,徐志明   

  1. 华北电力大学能源动力与机械工程学院,北京102206;东北电力大学研究生部,吉林省 吉林市132012
  • 出版日期:2011-07-03 发布日期:2011-07-03

  • Online:2011-07-03 Published:2011-07-03

摘要:

针对超声波在防除垢对场协同的影响,采用FLUENT软件中的两相流模型、空化模型和标准的Κ-ε湍流模型,获得流场压强随时间步长的变化规律,即流场波动呈类似正弦波波动。引入空化数的概念,并利用π定理推导Reynolds数和空化数的函数关系,即Reynolds数与空化数呈幂函数关系,Reynolds数随着空化数的增加而减小,再根据场协同原理,表示出空化数和场协同数的关系,得到场协同数随着空化数的增大而增大,从而强化了换热器与外界的热交换。

关键词: 空化数FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast" lang=EN-US>;ReynoldsFONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">数FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast" lang=EN-US>;FONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">场协同数

Abstract:

In order to eliminate the influence generated by ultrasonic scale removalin,the two-phase flow model,the cavitations model and the standard Κ-ε turbulence model in fluent software are adopted in the paper.The results showed the relationship between the variation regularities of flow field pressure and the time step, the flow field wave is a light like the fluctuation of sine wave.The concept of cavitation number is introducedand the functional relationship which is deduced by π theorems between Reynolds number and cavitation number is programmed for these experiment.Experiments show that the Reynolds number decreases with the cavitation number increase.With the relation of the field synergy number and the cavitation numberthe  field synergy number increases with the cavitation number increasein thatit strengthens the heat-transfer efficiency between thermal exchanger and the environment.

Key words: 空化数FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast" lang=EN-US>;ReynoldsFONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">数FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast" lang=EN-US>;FONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">场协同数