Advanced Pumping Systems
The transport of viscous fluids is a central function of many biomedical systems. We are studying advanced pumping concepts as alternatives to classical pumping systems with, e.g., rotating parts. We focus on pumping concepts with only minimal mechanical impact on the transported fluid and which lend themselves to miniaturization. This includes the concepts of peristaltic action, acoustic or steady streaming phenomena. Our work addresses various applications of such concepts in the clinical context, e.g. therapeutic devices and implants. In most projects we use a combination of computational and experimental methods to obtain a comprehensive picture of a studied biomedical flow system.
Numerical Modelling of Gastric Mixing Flows
The stomach mixes food and gastric secretion by the combined action of peristaltic motions, so-called Antral Contraction Waves (ACW), and the controlled opening and closing of the pyloric sphincter. As the volume in front of an ACW diminishes, fluid is forced back through the partial occlusion thereby grinding and stirring the gastric content. The objective of this project is to quantify flow forces and mixing rates in order to improve the understanding of gastric mixing mechanisms.
Contact: Magnus Jonsson, PhD
The impedance pump is a very simple pumping concept with no moving parts other than the compliant wall of the pipe carrying the transported medium. The pumping action is generated by periodic compression of a short section of the pipe which is more compliant than the rest of the pipe. We are studying the design of small- to micro-scale impedance pumps for applications in the med-tech sector.
Contact: Prof. Dominik Obrist, PhD