http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ali Lohi (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Ali Rahimzadeh,Farhad Ein-Mozaffari,Ali Lohi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
The use of coaxial mixers has significantly improved gas dispersion in non-Newtonian fluids. However, tothe best of our knowledge, no scale-up investigation of an aerated coaxial mixer has been reported in theliterature. This study aims to explore the gas hold-up, energy dissipation rate, power consumption andcavity size in order to provide the guideline for scaling-up of the coaxial mixers. Through the use of computationalfluid dynamics and electrical resistance tomography, the effects of the aeration rate, centralimpeller type, rotating mode, impeller speed, and pumping direction on the gas dispersion efficacy inboth small-scale and large-scale coaxial mixers containing non-Newtonian fluids were investigated. For the coaxial mixer in the co-rotating mode, the same flow regime was achieved when the centralimpeller tip speed and the anchor impeller rotational speed were kept constant in both small-scaleand large-scale systems. It was observed that maintaining the aeration rate per volume of the non-Newtonian fluid constant was beneficial to preserve the performance of the large-scale coaxial mixerthe same as its small-scale counterpart. The use of specific power consumption as a scale up criterioneffectively improved the energy dissipation rate uniformity, which is critical for shear sensitiveapplications.
-
Amira Abdelrasoul,Huu Doan,Ali Lohi,Chil-Hung Cheng 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
Tha aim of the present study was to develop a series of numerical models for an accurate prediction of the power consumption in ultrafiltration of simulated latex effluent. The developed power consumption model incorporated fouling attachment, as well as chemical and physical factors in membrane fouling, in order to ensure accurate prediction and scale-up. This model was applied to heterogeneous membranes with non-uniform pore sizes at a given operating conditions and mem- brane surface charges. Polysulfone flat membrane, with a membrane molecular weight cutoff (MWCO) of 60,000 dalton, at different surface charges was used under a constant flow rate and cross-flow mode. In addition, the developed models were examined using various membranes at a variety of surface charges so as to test the overall reliability and accuracy of these models. The power consumption predicted by the models corresponded to the calculated values from the experimental data for various hydrophilic and hydrophobic membranes with an error margin of 6.0% up to 19.1%.
-
Masoume Ehsani,Huu Doan,Ali Lohi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8
One of the most critical issues encountered in membrane-based separation processes is permeate flux decline in a system operating for a long period. The particles in the feed solution tend to foul the membrane surface or membrane pores, which results in pore blocking and/or cake formation on the surface. In this regard, the use of membrane cleaning techniques for the membrane flux restoration has gained more attention. Ultrasonic (US) irradiation is an alternative technique applied to the feed solution passing across the membrane surface to either prevent the fouling formation (fouling control) or dislodge the foulants (surface cleaning). Ultrasonic cleaning mechanisms are based on sound waves travelling through the liquid, which leads to physical and chemical effects. This cleaning technique is an environmentally friendly process in which no chemical or biological agents are used. This article briefly reviews different types of fouling and classes of foulants, fouling evolution mechanisms, mathematical modelling of fouling, surface cleaning and fouling control strategies, with the emphasis on ultrasound-assisted fouling control process as an innovative cleaning method. The effect of the operational parameters on the performance of the US-assisted filtration processes, highlights, challenges, and future outlook of US cleaning will be discussed.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
