STUDYING THE PARAMETERS AFFECTING THE PERFORMANCE OF THE PERISTALTIC PUMP AND DESIGNING A SAMPLE

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.