- An Insect Style of Flow Transport: Selective Micropumping in a Network
A paradigm for selective pumping of fluids in a complex network of channels in the microscale flow regime is presented. The model is inspired by internal flow distributions produced by the rhythmic wall contractions observed in many insect tracheal networks. The approach presented here is a natural extension of previous two-dimensional modeling of insect-inspired microscale flow transport in a single channel, and aims to manipulate fluids efficiently in microscale networks without the use of any mechanical valves. This selective pumping approach enables fluids to be transported, controlled and precisely directed into a specific branch in a network while avoiding other possible routes. The Stokeslets-meshfree method is used in this study to solve the Stokes equations that govern the flow motions in a network with moving wall contractions.
A paradigm for selective pumping of fluids in a complex network of channels in the microscale flow regime is presented. The model is inspired by internal flow distributions produced by the rhythmic wall contractions observed in many insect tracheal networks. The approach presented here is a natural extension of previous two-dimensional modeling of insect-inspired microscale flow transport in a single channel, and aims to manipulate fluids efficiently in microscale networks without the use of any mechanical valves. This selective pumping approach enables fluids to be transported, controlled and precisely directed into a specific branch in a network while avoiding other possible routes. The Stokeslets-meshfree method is used in this study to solve the Stokes equations that govern the flow motions in a network with moving wall contractions.
- Stokeslets: 3D Pumping Model
We present a three-dimensional model for flow pumping in a channel/tube induced by two moving
contractions from the upper wall. This pumping model is inspired by insect respiration processes, specifically,
the rhythmic collapses that take place within their tracheal tube networks. The formal goal of this article is to compare three-dimensional Stokesletsmeshfree numerical results with results from our previous two-dimensional analytical pumping model. We use regularized Stokeslets-meshfree computations in three dimensions to reconstruct the flow motions induced by wall contractions and to calculate the time-averaged net flow pumping rate.
We present a three-dimensional model for flow pumping in a channel/tube induced by two moving
contractions from the upper wall. This pumping model is inspired by insect respiration processes, specifically,
the rhythmic collapses that take place within their tracheal tube networks. The formal goal of this article is to compare three-dimensional Stokesletsmeshfree numerical results with results from our previous two-dimensional analytical pumping model. We use regularized Stokeslets-meshfree computations in three dimensions to reconstruct the flow motions induced by wall contractions and to calculate the time-averaged net flow pumping rate.
- A Bioinspired Pumping Model for Flow in a Microtube
Inspired by respiratory system in insects, in particular the rhythmic wall contractions found in insect's tracheal tubes, we propose a bioinspired pumping model that can work particularly well in the low Reynolds number flow regime. Incompressible, viscous flow transport in a fluid-filled axisymmetric, inelastic tube with rhythmic wall contractions is modeled using the lubrication theory. The wall contractions are prescribed via a tube profile with two indentation sites that can move with time lags with respect to each other. The analytical model is validated using the method of fundamental solutions based on the Stokeslets-meshfree computational method. The velocity field, pressure and time averaged net flow rate induced in a complete contraction cycle are calculated. Results demonstrate that an inelastic tube with at least two contracting spots can produce unidirectional flow and working as pumping mechanism.
Inspired by respiratory system in insects, in particular the rhythmic wall contractions found in insect's tracheal tubes, we propose a bioinspired pumping model that can work particularly well in the low Reynolds number flow regime. Incompressible, viscous flow transport in a fluid-filled axisymmetric, inelastic tube with rhythmic wall contractions is modeled using the lubrication theory. The wall contractions are prescribed via a tube profile with two indentation sites that can move with time lags with respect to each other. The analytical model is validated using the method of fundamental solutions based on the Stokeslets-meshfree computational method. The velocity field, pressure and time averaged net flow rate induced in a complete contraction cycle are calculated. Results demonstrate that an inelastic tube with at least two contracting spots can produce unidirectional flow and working as pumping mechanism.
- A Ghost-Valve (GV) Theory for Flow Transport at Low Re
A microchannel with at least two contracting membranes that move with a slight time lag can break symmetry and produces a unidirectional net flow. Inspired by microscale internal flow transport phenomena in insect tracheal networks, which are observed to be induced by the rhythmic tracheal wall contractions. A novel bioinspired pumping paradigm ``ghost-valve pumping principle'' which is neither peristaltic nor belongs to impedance mismatch class of pumping mechanisms is given. This insect-inspired pumping model is expected to function efficiently in the low Re flow regime and can be used in many of biomedical microdevices.
A microchannel with at least two contracting membranes that move with a slight time lag can break symmetry and produces a unidirectional net flow. Inspired by microscale internal flow transport phenomena in insect tracheal networks, which are observed to be induced by the rhythmic tracheal wall contractions. A novel bioinspired pumping paradigm ``ghost-valve pumping principle'' which is neither peristaltic nor belongs to impedance mismatch class of pumping mechanisms is given. This insect-inspired pumping model is expected to function efficiently in the low Re flow regime and can be used in many of biomedical microdevices.
- Ghost-Valve Toy Model for Micropuming
1- Let x= 2y
2- Stagnation lines ( Ghost Valve -GV ) birth/death are formed as below
3- Count how much flow you collect on both sides given the fact that, flow can not cross stagnation lines
4- Symmetry breaking and net flow is created using time-lag and manipulating GV in the channel
1- Let x= 2y
2- Stagnation lines ( Ghost Valve -GV ) birth/death are formed as below
3- Count how much flow you collect on both sides given the fact that, flow can not cross stagnation lines
4- Symmetry breaking and net flow is created using time-lag and manipulating GV in the channel