Improving Your Pressure Pump
Introduction
Microfluidic device. (kabayishi, 2009)These are devices which are normally used in biology and bio-techniques for diagnosis, most of these devices may be categorized either passive or active device. Both active and passive have several parts. Active micro fluids consist of microfluidic valves that pump automatically while passive consists of mixers, rich chambers gradient generator splitters and mixers.
Improving your pressure pump.
Increase in pressure pump increases the rate of flow in microfluidic and pulse flow where device in pressure pump reduces rate of pulse flow in microfluidic. (Thorsen,2009) Microfluidic have no moving parts hence pressure device flows is much more smooth. Pressure increases in the liquid depending on the speeding of the liquid hence enable faster flow rate.
Increase radius by 10%
When micrometric diameter of the tube is increased more air bubbles are formed inside the microfluidic device. (Chung, 2010)This are the bubbles, which are very detrimental and very difficult to remove during experimental set up. Due to air bubbles there will be high range of solution in microfluidic device. The presence of air bubbles inside microfluidic device will cause flow rate instability and this increases the pressure equilibrium in microfluidic device. This is because air will absorb some of the pressure inside the microfluidic device.
By increasing the length by 50%-this is the best method to be used
When the length of a microfluidic device for example increases the Reynold number will be high and the flow will also be high hence mass becomes smaller (Yang,2006). When the length is reduced, the Reynold number decreases and flow will become laminar and mass increases.
Decrease the flow speed by 25%
Decreasing the flow speed of the fluid will reduce the strength of micro fluid. The rate at which micro fluid will move will determine the rate flow. Mellor’s (2010) At a low rate of speed flow, the air bubble will accommodate in microfluidic device which will reduce the rate of pulse flow in the microfilm.
Question 2
- (i) (Lagally,2010). Increase in the rate of change in temperature will increase the magnitude of the film. The heat flow across the thin film layer of the microfilm enhances magnitude increase. The temperature variations of layer is the heat capacity of thermal-conduct of the microfilm layer. Whenever there is a thin film there is consequently increase in magnitude of the microfilm.
- (ii) Wavelength is inversely proportional to frequency.
Question
Current=I=PA AT/t
Current=PA AT/t
P=pyroelectric coefficient. 20×10-6cm/m2
A=Area of electrode. 3×10-4m2
T=change in temperature
t=Time
PA(AT)/RC
And whenever there is thick film there is less magnitude. This implies that temperature also depends upon thickness of the film.
??α???V
??constant(c)
Where speed c= speed of light
Vα€
Or €αV
€=hV where h constant
(a)PA(AT)/RC
1=PA AT/t
PACAT/
3×10-4m×20×106cm/m2
=60×102
(iii)Explain relationship between thickness and capacity capacitance of the film.
(v) The relationship between the thickness and capacity of the thin film is inversely proportion to each other. When the thickness is higher the capacitance becomes lower while when capacity becomes higher the thickness of film decreases. (Chung,2008) Thickness of a film will dictate how much electric field flux will develop a certain amount of electric field force. The greater the plate, the greater the capacitance.Relationship between dialectic constant of the thin film and area of the thin film.
(iv) when you double layer of the capacitance there will be double electrical effect. This will obscene between a conductive electrode and an adjacent liquid. At this point of two layer of ions with opposing polarity form if voltage is applied. (Kobaiyishi, 2010)The two layer is normally separated by single layer of a molecular which is solvent and adhere to the surface of the electrode which later acts like a di electric in the capacitor conventional, hence the amount of electric charge stored in a double layer is directly proportional to the applied voltage dependence to the electrode surface.
References
Chung, B.G., Flanagan, L.A., Rhee, S.W., Schwartz, P.H., Lee, A.P., Monuki, E.S. and Jeon, N.L., 2008. Human neural stem cell growth and differentiation in a gradient-generating microfluidic device. Lab on a Chip, 5(4), pp.401-406.
Hosokawa, K., Fujii, T. and Endo, I., 1999. Handling of picoliter liquid samples in a poly (dimethylsiloxane)-based microfluidic device. Analytical chemistry, 71(20), pp.4781-4785.
Kobayashi, J., Mori, Y., Okamoto, K., Akiyama, R., Ueno, M., Kitamori, T. and Kobayashi, S., 2009. A microfluidic device for conducting gas-liquid-solid hydrogenation reactions. Science, 304(5675), pp.1305-1308.
Lagally, E.T., Medintz, I. and Mathies, R.A., 2010. Single-molecule DNA amplification and analysis in an integrated microfluidic device. Analytical chemistry, 73(3), pp.565-570.
Mellors, J.S., Jorabchi, K., Smith, L.M. and Ramsey, J.M., 2010. Integrated microfluidic device for automated single cell analysis using electrophoretic separation and electrospray ionization mass spectrometry. Analytical chemistry, 82(3), pp.967-973
Thorsen, T., Roberts, R.W., Arnold, F.H. and Quake, S.R., 2009. Dynamic pattern formation in a vesicle-generating microfluidic device. Physical review letters, 86(18), p.4163.
Wheeler, A.R., Throndset, W.R., Whelan, R.J., Leach, A.M., Zare, R.N., Liao, Y.H., Farrell, K., Manger, I.D. and Daridon, A., 2012. Microfluidic device for single-cell analysis. Analytical chemistry, 75(14), pp.3581-3586.
Yang, S., Ündar, A. and Zahn, J.D., 2006. A microfluidic device for continuous, real time blood plasma separation. Lab on a Chip, 6(7), pp.871-880.
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