Effect of Joule heating and temperature-dependent zeta potential on electroosmotic flow measurements in calorimetric flow sensors

Micro & nano letters

article

Ahmad Altayyeb¹  Yu Sun²  Mohamed Abdelgawad³ 

[1] Center for Nanotechnology, Zewail City of Science and Technology;Department of Mechanical and Industrial Engineering, University of Toronto;Department of Mechanical Engineering, Assiut University;Department of Mechanical Engineering, American University of Sharjah, United Arab Emirates

关键词: osmosis;    permittivity;    electrophoresis;    flow measurement;    calorimetry;    electrical conductivity;    microchannel flow;    flow sensors;    electrohydrodynamics;    viscosity;    specific heat;    electrokinetic effects;    thermal conductivity;    Joule heating;    sensor characteristics;    temperature dependence;    calorimetric flow sensors;    electroosmotic flow measurements;    temperature-dependent zeta potential;    calorimetric flow sensing;    sensor performance;    wall zeta potential;    specific heat;    temperature-dependent properties;    modelled sensor;    electroosmotic flow;   

DOI  :  10.1049/mnl.2018.5671

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

This work reports a theoretical investigation of the effect of Joule heating and temperature-dependent zeta potential on the electroosmotic flow measurements in calorimetric flow sensing. Joule heating resulting from the applied electric field in electroosmotic flow increases the temperature of the liquid inside the sensor and, consequently, modifies the sensor performance. The model presented in this paper considers temperature dependence of the wall zeta potential on the sensor characteristics. Additionally, all liquid properties such as density, viscosity, relative permittivity, specific heat, thermal conductivity, and electrical conductivity are taken as temperature-dependent properties. A comparison between the characteristics of the modelled sensor in the presence and absence of Joule heating is presented. The effect of heater power on sensor characteristics is also discussed. Simulation results reveal that Joule heating and temperature dependence of zeta potential have a significant effect on the behaviour of calorimetric flow sensors, which must be considered when this type of sensor is used to measure electroosmotic flow. Temperature dependence of zeta potential, in particular, affected the velocity distribution inside the sensor considerably.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND