摘要：

对减压膜蒸馏传热传质机理进行了研究，在已有理论模型的基础上，考虑温度极化和浓差极化的影响，引入减压膜蒸馏传热传质理论模型，并对模型进行了计算，结果表明：随温度的升高，传质系数K_m升高，温度极化系数TPC减小，浓差极化系数CPC增大，通量呈近指数倍增加；随流速的增加，TPC增大，膜表面传热系数h_f增大，CPC略有降低，K_m略有升高，通量略有升高；随中空纤维填充数目的增大，通量减小；随真空度的增大，TPC减小，CPC

关键词: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">减压膜蒸馏；传热传质；通量

Abstract:

Heat and mass transfer processes in a vacuum membrane distillation (VMD）were studied.A theoretical model that considers the temperature polarization and concentration polarization was used in the calculation of VMD process.It was found that as temperature increased, the mass transfer coefficient K_m increased, the temperature polarization coefficient (TPC）decreased, the concentration polarization coefficient (CPC）increased, and the flux increased nearly exponentially.As the feed velocity increased, TPC and heat transfer coefficient h_f increased, CPC decreased slowly, K_m and the flux increased slowly.The flux decreased with the increase of number of fiber.As the vacuum increased, the TPC decreased, CPC and flux increased.The calculated results were in good agreement with the experimental data.

Key words: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">减压膜蒸馏；传热传质；通量