Modified Model of Bubble Formation in Non-Newtonian Fluids  

作　　者：马友光 范文元 姜韶堃 朱春英 李怀志 

机构地区：[1]State Key Laboratory of Chemical Engineering, Tianjin University [2]Laboratory of Chemical Engineering Science, CNRS- ENSIC-INPL, 1 rue Grandville, BP 451, 54001 Nancy Cedex, France

出　　处：《Transactions of Tianjin University》2009年第1期56-60,共5页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China (No.20476073);National Programme of Introducing Talents of Discipline to Universities (No.B06006).

摘　　要：Based on the comprehensive forces balance model, a modified model of the formation of a single bub-ble in non-Newtonian fluid under constant flowrate was developed by taking account of the effect of the ingoing gas through orifice as well as its variation on the radial expansion of bubble. The modified model involves the radial expansion equation of bubble surface and the forces balance equation in vertical direction of the bubble respec-tively. The shape variation of bubbles formed in polyacrylamide (PAM) aqueous solutions under various conditions was predicted numerically. The practical formation of bubbles was real-time visualized and recorded by a CCD camera and a computer by means of a special laser image measurement system. Results show that the predicted shapes of the bubbles by the present model agree well with experimental observation.Based on the comprehensive forces balance model, a modified model of the formation of a single bubble in non-Newtonian fluid under constant flowrate was developed by taking account of the effect of the ingoing gas through orifice as well as its variation on the radial expansion of bubble. The modified model involves the radial expansion equation of bubble surface and the forces balance equation in vertical direction of the bubble respectively. The shape variation of bubbles formed in polyacrylamide （PAM） aqueous solutions under various conditions was predicted numerically. The practical formation of bubbles was real-time visualized and recorded by a CCD camera and a computer by means of a special laser image measurement system. Results show that the predicted shapes of the bubbles by the present model agree well with experimental observation.

关 键 词：bubble formation non-Newtonian fluid orifice diameter gas flowrate 

分 类 号：O373[理学—流体力学]