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Modelling and simulation of micro pre-concentrator for pollution monitoring and explosive detection by trace level measurement of gas
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Author : Prakash Chandra Mishra
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ABSTRACT
This paper presents the complete modeling of the pre-concentration cycle for the optimization of a micro gas pre-concentrator applied to atmospheric pollution monitoring1. If the concentration of dangerous gases for health like benzene and nitrobenzene are in the ppb (Parts per billion) level2, and if not able to be detected by the gas sensor, then by using a pre-concentrator, the conversion of ppb level to ppm (Parts per million) level can be possible3. Hence, it can be easily detected by the gas sensors within a very short duration of time. Pre-concentrator is used for the improvement of the sensitivity of the gas sensor4. In the pre-concentrator with the use of adsorbent material for nitrobenzene and benzene gas, the accumulation of a measurable concentration of nitrobenzene gas or benzene gas on the porous Si as an adsorbent surface has been performed5. These molecules are then sending towards a detector (Gas Sensor) by desorbing it from the adsorbed surface. In this work, measurable concentrations of the gas are available in gas sensors which it can detect easily. The effect of the sensitivity of the device has been measured by varying the dimensions of the device. The simulation is done by COMSOL Multiphysics. The different designs and parameters (flow rate, heating cycle) have been investigated for performance optimization in terms of pre-concentrator factor and power consumption6.
KEYWORD
Micro pre-concentration modeling, COMSOL Multiphysics, CFD module, adsorption, desorption, heat transfer module, gas sensor, benzene, nitrobenzene