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Deriving an analytical model for hydro-magnetic micro flow controller

Esmaily Moghadam, M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1115/ICNMM2008-62132
  3. Publisher: 2008
  4. Abstract:
  5. Fluid control, namely pumping and valving, is a critical factor in the performance of micro-fluidic systems. In recent years a variety of micro-fluidic systems are developed for the purpose of miniaturizing fluid handling, and chemical analysis to develop Lab On a Chip (LOC) technology. The mentioned facts resulted in design and fabrication of a novel hydromagnetic flow controller. The idea behind this device is that magnetic particles, mixed and dispersed in a carrier liquid, can be accumulated in the form of a piston. Depending upon dragging speed of these pistons, which itself is a function of switching time, this device can be used to either increase (pumping) or decrease (valving) the flow rate. The valving characteristic of the setup, which occurs at higher switching times, was concurrent with regular forming of pistons in micro-tube. Experimental results in this part show a meaningful trend for the flow rate changes versus effective parameters of the flow. Considering this fact, lead us to propose a mathematical (analytical) model, which is a function of concerning parameters. Pressure head difference, concentration, material of particles, switching time, working fluid and, switching mode, depending on their complexity, have been introduced into the mathematical model, completely theoretically or semiexperimentally. The equations were derived based on the recognition of the leakage flow through the formed pistons and the pumped flow after each switching. The model was validated by the experimental results for nickel particles of less than 10μ in diameter and 0.5gNi/100cch2O concentration in water for a defined pressure head in a pressure driven flow setup. Copyright © 2008 by ASME
  6. Keywords:
  7. Analytical model ; Carrier liquid ; Critical factors ; Effective parameters ; Flow rate changes ; Fluid control ; Fluid handling ; Hydromagnetic flows ; Lab on a chip ; Leakage flow ; Magnetic particle ; Micro-flow ; Microtube ; Nickel particles ; Pressure heads ; Pressure-driven flows ; Switching modes ; Switching time ; Working fluid ; Engines ; Flow control ; Fluidic logic devices ; Functions ; Leakage (fluid) ; Microchannels ; Pistons ; Pumps ; Switching ; Mathematical models
  8. Source: 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008, Darmstadt, 23 June 2008 through 25 June 2008 ; Issue PART B , June , 2008 , Pages 1139-1146 ; 0791848345 (ISBN); 9780791848340 (ISBN)
  9. URL: https://asmedigitalcollection.asme.org/ICNMM/proceedings-abstract/ICNMM2008/48345/1139/336111