Enhancement of thermal exchanges in natural convection assisted by ultrasound - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Enhancement of thermal exchanges in natural convection assisted by ultrasound

Résumé

In order to preserve fossil fuels, there is a path that consists of improving the energy efficiency of industrial systems, in particular in the thermal industry. Several approaches are explored in this sense such as the use of metallic foams, thermoacoustics, nanoparticles and phase change materials. These are heat transfer improvement approaches that do not require the use of moving parts, which is a definite advantage for the reliability of the proposed solutions. This work is part of this approach, which consist to study experimentally the effects of the application of a low frequency acoustic field (frequency 16-100KHZ) on the natural convection heat transfer between a heating element and water. Two liters of distilled water are heated by Joule effect through a resistance of variable power between 60W and 200W incorporated in a cylinder immersed in a rectangular water tank. Six K-type thermocouples was distributed in the water tank to measure the temporal evolution of the water temperatures in the heating and cooling phase. A piezoelectric transducer has been placed on one side of the tank and can vibrate at the fixed frequency of 35 kHz. Acoustic currents were generated in the tank which allowed to intensify the heat exchange by natural convection between the tank water and the heating element. The preliminary results obtained, as well as their discussion, are presented in this work.
Fichier non déposé

Dates et versions

hal-02172768 , version 1 (04-07-2019)

Identifiants

  • HAL Id : hal-02172768 , version 1

Citer

Abdelmalek Hamadouche, Smaïne Kouidri, Rachid Nebbali. Enhancement of thermal exchanges in natural convection assisted by ultrasound. International Conference on MATERIALS and ENERGY, Apr 2018, San Sebastian, Spain. ⟨hal-02172768⟩
45 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More