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Heat and mass transfer improvement using self-rewetting nanofluids

Abstract : Thermal management is currently a major issue in many sectors of industry. Heat transfer devices (like Heat Pipes, Heat exchangers…) are integrated systems that use transfer modes by convection, evaporation and condensation. The efficiency of heat exchange can be improved by using a new nanotechnology method known as nanofluids. Nanofluids are suspensions of nano-size particles (from 2 to 100nm) in the fluids. This improvement is due to the significant increase in the effective conductivity in the range 10-50% as well as their convective heat transfer coefficients. However, limitations related to the phenomena of nanoparticle, sedimentation and aggregation appear during different phases. In this project, in order to optimize the performance and stability of nanofluids, two different methods were used: an optical one coupled to an infrared thermography method and a high frequency acoustic method. The selection of nanoparticles was based on their thermal performance during evaporation of sessile droplets using a Kruss system, under same conditions and at different concentrations. Thus, high frequency acoustic waves, at the surface, make it possible to analyze the stabilities of nanoparticles during its evaporation where these particles are in suspension with base fluids such as ionized water, self-rewetting binary mixture (To improve the circulation of fluids inside heat pipes thanks to their physical properties like thermal Marangoni, concentration Marangoni, capillary...). The selected nanofluids will be used later to analyze experimentally their performance on two-phase capillary fluid loop heat transfer devices and in micro-channel heat exchangers by finding and calculating the thermal resistance of the system, convection heat transfer coefficient and wall temperature.
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Submitted on : Monday, October 18, 2021 - 5:05:42 PM
Last modification on : Thursday, November 25, 2021 - 9:38:04 AM

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  • HAL Id : tel-03383929, version 1

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Ibrahim Zaaroura. Heat and mass transfer improvement using self-rewetting nanofluids. Thermics [physics.class-ph]. Université Polytechnique Hauts-de-France; Institut National des Sciences Appliquées Hauts-de-France, 2020. English. ⟨NNT : 2020UPHF0024⟩. ⟨tel-03383929⟩

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