Local Heat Transfer Process for a Gas鈥揕iquid System in a Wall Region of an Agitated Vessel Equipped with the System of CD6-RT Impellers

详细信息    查看全文

• 作者：Iwona Bielka ; Magdalena Cudak ; Joanna Karcz
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 22, 2014
• 年：2014
• 卷：53
• 期：42
• 页码：16539-16549
• 全文大小：561K
• ISSN：1520-5045

文摘

The results of the experimental studies of local heat process for a gas鈥搇iquid system in the region of the cylindrical wall of an agitated vessel equipped with the system of CD 6鈥揜T impellers are presented. A lower CD 6 impeller (Smith turbine) and upper RT impeller (Rushton turbine) were located on the common shaft in a baffled agitated vessel of inner diameter equal to 0.3 m. Liquid height in the agitated vessel was equal to 0.6 m. Newtonian liquids of different physical properties were used as a continuous phase. Air was dispersed in the liquid. Local heat transfer coefficients were measured using both thermal and electrochemical methods. In total, 2280 experimental points were obtained. Distributions of the heat transfer coefficients were described by means of eqs 12鈥?7 and 18鈥?3 as a function of the Re and Pr numbers, dimensionless axial coordinate z/H, and modified Fr_g number, separately, for turbulent and transitional ranges of the fluid flow in the agitated vessel. Equations 12鈥?7 and 18鈥?3, concerning both coalescing and noncoalescing gas鈥搇iquid systems, have no equivalent in the open literature.