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Design of a Regulated Micromachined ...

Raju, Mukesh Arvind.

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Design of a Regulated Micromachined Air-Sniffer Using Thermal Transpiration Effect for E-Nose Applications.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design of a Regulated Micromachined Air-Sniffer Using Thermal Transpiration Effect for E-Nose Applications./
Author:	Raju, Mukesh Arvind.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	104 p.
Notes:	Source: Masters Abstracts International, Volume: 82-12.
Contained By:	Masters Abstracts International82-12.
Subject:	Fluid mechanics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28493082
ISBN:	9798505511862

Design of a Regulated Micromachined Air-Sniffer Using Thermal Transpiration Effect for E-Nose Applications.
Raju, Mukesh Arvind.

Design of a Regulated Micromachined Air-Sniffer Using Thermal Transpiration Effect for E-Nose Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 104 p.

Source: Masters Abstracts International, Volume: 82-12.

Thesis (M.A.Sc.)--University of Windsor (Canada), 2021.

This item must not be sold to any third party vendors.

Microfluidics artificial olfaction systems are used for plant disease diagnosis in the agricultural field. In an electronic nose, the sniffer draws the air towards an array of gas sensors that detect volatile organic compounds corresponding to diseased plants. The currently available electronic noses involve a mechanical pump of moving parts prone to friction losses, limiting large-scale application. In this work, a microchannel that works on thermal transpiration principle to control the airflow inside it is proposed and designed. It has the potential to be employed as a sniffer component for electronic noses, designed using microelectromechanical systems. COMSOL Multiphysics simulation software is used to identify the design parameters of a three-dimensional microchannel and determine the airflow velocity resulting from the applied temperature using the Navier-Stokes and Energy equation. The heat transfer and fluid flow have been modelled for two different channel geometries (i.e., rectangular, and cylindrical) and two materials (i.e., pyrex and silicon). The proposed microchannel geometries are optimised to obtain the Knudsen number in the range of 0.001 < Kn < 0.1 corresponding to a slip flow regime, for a maximum temperature of 70 °C at the end of the microchannel, connected to the sensor array. The rectangular microchannel design was chosen to simplify the microfabrication step. The heat transfer capacity and airflow velocity studied by varying the microchannel wall thickness showed that they were unaffected by wall thickness. The influence of temperature on the microchannel and the volume of air pumped in by thermal transpiration is evaluated for four different temperatures, namely 40 °C, 50 °C, 60 °C and 70 °C. It is observed that the temperature influences the velocity and volume of air pumped inside the microchannel and 70 °C projected the highest flowrate velocity with maximum air volume. Natural convection method is applied to calculate the cooling down time for the microchannel, which is in the range of 2.5 Wm-2K to 25 Wm-2K when exposed to external environment. The microchannel cooling rate is inversely proportional to the heat transfer coefficient. In conclusion, the optimal thermal transpiration effect inside a rectangular microchannel occurred at 70 °C, and the material pyrex can serve as a candidate material for the microchannel fabrication.

ISBN: 9798505511862Subjects--Topical Terms:

528155
Fluid mechanics.
Subjects--Index Terms:

COMSOL

Design of a Regulated Micromachined Air-Sniffer Using Thermal Transpiration Effect for E-Nose Applications.
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245 1 0 $a Design of a Regulated Micromachined Air-Sniffer Using Thermal Transpiration Effect for E-Nose Applications.
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300 $a 104 p.
500 $a Source: Masters Abstracts International, Volume: 82-12.
500 $a Advisor: Jianu, Ofelia A.;Emadi, Arezoo.
502 $a Thesis (M.A.Sc.)--University of Windsor (Canada), 2021.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Microfluidics artificial olfaction systems are used for plant disease diagnosis in the agricultural field. In an electronic nose, the sniffer draws the air towards an array of gas sensors that detect volatile organic compounds corresponding to diseased plants. The currently available electronic noses involve a mechanical pump of moving parts prone to friction losses, limiting large-scale application. In this work, a microchannel that works on thermal transpiration principle to control the airflow inside it is proposed and designed. It has the potential to be employed as a sniffer component for electronic noses, designed using microelectromechanical systems. COMSOL Multiphysics simulation software is used to identify the design parameters of a three-dimensional microchannel and determine the airflow velocity resulting from the applied temperature using the Navier-Stokes and Energy equation. The heat transfer and fluid flow have been modelled for two different channel geometries (i.e., rectangular, and cylindrical) and two materials (i.e., pyrex and silicon). The proposed microchannel geometries are optimised to obtain the Knudsen number in the range of 0.001 < Kn < 0.1 corresponding to a slip flow regime, for a maximum temperature of 70 °C at the end of the microchannel, connected to the sensor array. The rectangular microchannel design was chosen to simplify the microfabrication step. The heat transfer capacity and airflow velocity studied by varying the microchannel wall thickness showed that they were unaffected by wall thickness. The influence of temperature on the microchannel and the volume of air pumped in by thermal transpiration is evaluated for four different temperatures, namely 40 °C, 50 °C, 60 °C and 70 °C. It is observed that the temperature influences the velocity and volume of air pumped inside the microchannel and 70 °C projected the highest flowrate velocity with maximum air volume. Natural convection method is applied to calculate the cooling down time for the microchannel, which is in the range of 2.5 Wm-2K to 25 Wm-2K when exposed to external environment. The microchannel cooling rate is inversely proportional to the heat transfer coefficient. In conclusion, the optimal thermal transpiration effect inside a rectangular microchannel occurred at 70 °C, and the material pyrex can serve as a candidate material for the microchannel fabrication.
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650 4 $a Electrical engineering. $3 649834
653 $a COMSOL
653 $a E-nose sniffer
653 $a MEMS
653 $a Microchannel
690 $a 0204
690 $a 0544
710 2 $a University of Windsor (Canada). $b ELECTRICAL ENGINEERING. $3 3170707
773 0 $t Masters Abstracts International $g 82-12.
790 $a 0115
791 $a M.A.Sc.
792 $a 2021
793 $a English
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