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- 저자 : Mohammad Behshad Shafii (검색결과 2 건)
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Mohammad Zabetian,Mohammad Hassan Saidi,Mohammad Said Saidi,Mohammad Behshad Shafii 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
Particle manipulation using laser beam is almost a new and contactless technique in particulate sciences. The method is based on theradiation pressure of light photons on the particles suspended in a semi-transparent fluid. Applications of the technique mainly covermicroscopic separation and detection of biological objects. In this work, a theoretical study is conducted to investigate the hydrodynamicand thermal effects on a particulate flow in a mini-channel. Laser thermal effects are studied as a result of light absorption either in fluidor dispersed phase. An analytical model is developed to be the real simulator of a test bed developed by the authors. The main objectiveof performed simulation is to determine the conditions of hydrodynamic laser-particle interaction and the contribution of thermal effects. More specifically, the criteria for size of particles and beam parameters to meet the mentioned conditions are presented. The model resultsare used for design and selection of elements in a particle manipulation system.
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Mohamad Ali Bijarchi,Amirhossein Favakeh,Mohammad Behshad Shafii 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
In this study, ferrofluid droplet formation from a nozzle in the presence of a non-uniform Pulse-WidthModulated (PWM) magneticfield with different angles was studied experimentally. A Drop-on-Demandplatform was introduced and three different regimes of droplet formation were observed. The regimemap of the droplet formation was presented. A new type of droplet formation evolution was observed inwhich the droplet is formed while it is swinging around the nozzle, and the satellite droplet is notgenerated in this regime. The effects offive important parameters including magneticflux density,applied magnetic frequency, duty cycle, distance between the nozzle and the center of the upper surfaceof the coil, and the angle of magnetic coil with respect to gravity on droplet diameter, formationfrequency, number of pulses for one droplet generation, and droplet formation evolution wereinvestigated. Results demonstrated that by increasing the magneticflux density and duty cycle, and bydecreasing applied magnetic frequency, the droplet diameter decreases, whereas the formationfrequency increases. Also, the minimum droplet diameter was observed at the distance of 10 mm and theangle of 45 . Finally, a correlation for dimensionless droplet diameter was proposed with an averagerelative error of 2.8%.
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