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반고형제제의 유동특성에 관한 연구 (제2보) : 바셀린의 온도의존성 유동거동
김정화(Jeong Hwa Kim),송기원(Ki Won Song),장갑식(Gap Shik Chang),이장우(Jang Oo Lee),이치호(Chi Ho Lee) 대한약학회 1997 약학회지 Vol.41 No.1
Using a concentric cylinder type, rheometer. the steady shear flow properties of vaseline were measured over the temperature range of 20~70oC. In this paper, the shear rate and temperature dependencies of its flow behavior were investigated and the validity of some flow models was examined. In addition, the flow characteristics over a wide temperature range were quantitatively evaluated by calculating the various material parameters. Main findings obtained from this study can be summarized as follows: (1) At relatively lower temperature range, vaseline is a plastic fluid with a yield stress and its flow behavior shows shear-thinning characteristics. (2) As the temperature increases, the value of a yield stress and the degree of shear-thinning become smaller, consequently, the Newtonian flow behavior occurs at a lower shear rate range. (3) At temperature range lower than 45oC, the flow behavior shows much stronger temperature dependence, and a larger activation energy is needed for flow. (4) The Herschel-Bulkley model is the most effective one g3 to predict the flow behavior of vaseline having a yield stress. The validity of the Bingham and Casson models becomes more available with increasing temperature. The flow behavior of vaseline at temperature range higher than 45oC can be perfectly described by the Newton model.
반고형제제의 유동특성에 관한 연구 (제1보) : 치약의 정상전단 유동거동
김정화,송기원,이장우,이치호,Kim, Jeong-Hwa,Song, Ki-Won,Lee, Jang-Oo,Lee, Chi-Ho 한국약제학회 1995 Journal of Pharmaceutical Investigation Vol.25 No.3
The steady shear flow properties of six kinds of commercial toothpastes were measured using a concentric cylinder type rheometer. In this paper, the shear rate and temperature dependencies of their flow behavior were investigated and the validity of the Casson and Herschel-Bulkley models was examined. Further, the flow properties over a wide temperature range were quantitatively evaluated by calculating the various material parameters. Main results obtained from this study can be summarized as follows: (1) Toothpastes are plastic fluids with a yield stress and their flow behavior shows shear-thinning characteristics. (2) With increasing temperature, the degree of shear-thinning becomes weaker and the Newtonian flow behavior occurs at a lower shear rate range. (3) The Herschel-Bulkley model is more effective than the Casson model in predicting their flow behavior. (4) As the temperature increases, the yield stress, plastic viscosity and consistency index become smaller, on the contrary, the flow behavior index becomes larger.
반고형제제의 유동특성에 관한 연구 ( 제1보 ) : 치약의 정상전단 유동거동
김정화,송기원,이장우,이치호 ( Jeong Hwa Kim,Ki Won Song,Jang Oo Lee,Chi Ho Lee ) 한국약제학회 1995 Journal of Pharmaceutical Investigation Vol.25 No.3
The steady shear flow properties of six kinds of commercial toothpastes were measured using a concentric cylinder type rheometer. In this paper, the shear rate and temperature dependencies of their flow behavior were investigated and the validity of the Casson and Herschel-Bulkley models was examined. Further, the flow properties over a wide temperature range were quantitatively evaluated by calculating the various material parameters. Main results obtained from this study can be summarized as follows: (1) Toothpastes are plastic fluids with a yield stress and their flow behavior shows shear-thinning characteristics. (2) With increasing temperature, the degree of shear-thinning becomes weaker and the Newtonian flow behavior occurs at a lower shear rate range. (3) The Herschel-Bulkley model is more effective than the Casson model in predicting their flow behavior. (4) As the temperature increases, the yield stress, plastic viscosity and consistency index become smaller, on the contrary, the flow behavior index becomes larger.