CFD Analysis of Electromagnetic Based Valveless Pump

Abstract

This study is a CFD analysis of electromagnetic based valveless pump in biomedical devices and biological MEMS (bioMEMS) application. The focus of the studies are designing a well performed pump where the required displacement of diaphragm can still be achieved even when the force applied is reduced and also a mechanism that requires low input current. Various parameters such as radius of the microcoil and diaphragm; and thickness of the magnet are compared to help choosing a proper pump. By using DesignModeler, Magnetostatic Analysis and Static Structural Analysis of ANSYS, Inc. Version 13.0, the geometry was modeled at micro scale and the results of force and displacement on the diaphragm were simulated. The main findings are the pump only required to be applied with 1.94 mN of force to reach at least 0.11 mm of diaphragm displacement with the input current of 0.5 A. The dimensions of the actuator mechanism design are 1.4 mm of magnet thickness and 2.05 mm of diaphragm radius. Electromagnetic actuation was selected because it can contribute several main benefits which are faster reaction time, longer operational range and low actuating voltage. Thus, it is important to analyze the electromagnetic mechanism to further understand it. Furthermore, the numerical results proved that an actuator mechanism comprises of permanent magnet, PDMS diaphragm and microcoil can provides enough actuating force for a large diaphragm displacement to take place under a safe and consistent pumping process. Hence, the electromagnetic pump design by this study can be used as the best application for microfluidic systems where a high pumping amount is desired.

Experimental Study on Net Flow Rate Generation Inside Closed Loop Mechanical Circulatory System Using Impedance Pump

“…Impedance pump is still on subjective deliberation and starting to gain interest due to its potential. Due to its intricate nature and reliance on some parameters, many researchers have simplified its model from various numerical studies [7][8][9][10] and identified the parameters and documented the behavior of the flow from experimental studies [11][12][13].…”

Contribuições para o desenvolvimento de eletrodos interdigitados e atuadores eletromagnéticos com aplicações em dispositivos microfluídicos portáteis

“…O atuador eletromagnético leva vantagem nesse cenário por possuir um tempo de resposta rápido e ao mesmo tempo por oferecer um grande deslocamento da membrana de atuação, valores acima de 100µm. No entanto, a corrente máxima que passa pela bobina, quando esta está integrada ao dispositivo, deve ser cuidadosamente levada em consideração, pois pode causar o aquecimento excessivo do fluido e do dispositivo [110]. Além dessas vantagens qualitativas em relação a outros métodos de atuação, o eletromagnético foi escolhido para as aplicações desta tese por que possuía compatibilidade com os processos e facilidade de fabricação nos laboratórios disponíveis.…”