پديد آورندگان :
فتحي, محمد صادق دانشگاه صنعتي شريف - دانشكده ي مهندسي مكانيك , حكاكي فرد, علي دانشگاه صنعتي شريف - دانشكده ي مهندسي مكانيك
كليدواژه :
پريستالتيك , فشردگي لوله , سرعت سيال و دبي , فشار سيال
چكيده فارسي :
در اين نوشتار ابتدا «حركت پريستالتيكي» به طور عام معرفي شده و بعد پمپ ساخته شده بر مبناي اين حركت و كاربرد آن بررسي شده است. سپس حركت سيال در يك پمپ پريستالتيكي كه به وسيله ي اين مدل حركتي، سيال درون لوله را جابه جا مي كند، بررسي شده است. ابتدا با المان گيري سيال در ناحيه ي فشردگي ديواره ي لوله ي پمپ و نوشتن معادلات نوير استوكس (در حالت پايا) و ساده سازي معادلات با در نظر گرفتن شرايط مرزي لوله، توزيع سهموي سرعت سيال در لوله و نحوه ي تغييرات دبي پمپ به دست آمده است. سپس روابط فشار كششي پوسته ي لوله و فشار غلتك پمپ و فشار سيال نوشته شده و رابطه ي تعادلي بين اين نيروها ارايه شده است. پس از آن با انتخاب فشار بيشينه ي سيال، نمونه يي خاص طراحي شده است. در ادامه رابطه ي بين سه متغير فشردگي لوله، فشار سيال و فشار كشساني لوله به خوبي توصيف شده است. همچنين نشان داده شده است كه يك رابطه ي خطي بين سرعت، حركت غلتك و سرعت انتقال سيال وجود دارد. نمودارهاي دبي و فشار و توزيع سرعت سيال در موقعيت هاي مختلف فشردگي لوله به دست آمده و دبي كل براي يك نمونه ي عددي خاص محاسبه شده است. دبي به دست آمده از پمپ)سيال آب(داراي چهار غلتك چرخان، حدود 0٫1 ليتر بر دقيقه به دست آمده است.
چكيده لاتين :
In this paper, first, the general idea of the peristaltic movement is introduced. Peristaltic movement is basically the contraction and expansion of a wall or pipe to move a fluid. Then, the peristaltic pump and its applications and the history of its development are introduced. Peristaltic pumps have many applications in the industry. Then, the movement of the fluid in the pipe of a peristaltic pump is investigated. To this end, the governing equations of a peristaltic pump are introduced and the considered assumptions are presented. Then, the solution to the Navier - Stokes equations (in the steady-state condition) is obtained by simplifying the governing equations, considering the involved boundary conditions. The obtained results are non-dimensionalized. Based on the obtained solution, the relationship of the parabolic radial velocity distribution inside the pump and the mass flow rate of the pump is determined. Then, based on the obtained solution, the tensile pressure of the pipe shell, the pressure applied to the wall by the pump roller, and the fluid pressure are obtained. Next, the relation between them is introduced by considering the equilibrium state between the forces applied to the tube shell. By considering the maximum fluid pressure of a sample pump, a peristaltic pump is designed for pumping water. Moreover, the flow and pressure diagrams and fluid velocity distributions at different tube compression positions of the designed pump are presented and discussed. As a result, the relationship among the pipe compression, the fluid pressure, and the tensile pressure of the pipe is well defined. Furthermore, the relationship between the flow rate of the pump and the speed of its rollers is presented. The linear relationship between the flow rate of the pump and the speed of its rollers is demonstrated and discussed. The volume of pumped fluid per minute is also calculated by determining the velocity of the rollers. The discharge flow from a pump (water fluid) with four rotating rollers is calculated about 0.1 liters per minute. In addition, a flow chart is presented to facilitate the procedures of designing peristaltic pumps.
