The study of surface phenomena and bubble formation at a submerged orifice

• Main Authors: Wei-Hua Lee, 李瑋華
• Other Authors: Yu-Min Yang
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/45930358341112739297

碩士 === 國立成功大學 === 化學工程研究所 === 83 === The formation of gas bubbles in liquids plays an important role in many physical and chemical processes in order to bring about efficient mass transfer and heat transfer between two phase. Many works have been made of bubble formation from a submerged single orifice in a liquid, and it is known that the gas chamber volume beneath the orifice exerts considerable influence on the bubble volume.Previous experimental and theo- retical works may be classified into three bubble formation conditions; (constant flow, constant pressure and the interme- diate condition). Aqueous surfactant solutions of SDS,DTMAC and Triton X-100 for bubble growth are studied in this paper.It appears that the surface tension effects are large at low flow rates and conti- nuously diminish as the flow rate is increased for the constant flow rate. In constant-flow rate regions, the experimental datas of SDS and DTMAC are predicted well by Ruff model (1972) which is considered the equilibrium surface tension,but Triton X-100 is not.However,the experimental datas of SDS and Triton X-100 are predicted not well by modified Ruff model that is considered the dynamic surface tension besides 2884ppm SDS.In intermediate flow rate regions, the experimental datas of SDS and Triton X-100 are predicted not well by Tsuge and Hibino model(1978) which is considered the equilibrium surface tension.