The study of magnetic field implementation on cylinder quenched in boiling ferro-fluid

Habibi Khoshmehr, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.applthermaleng.2013.11.063
  3. Abstract:
  4. It has been shown that nanofluids in different investigations increase or decrease heat transfer rate in boiling phenomenon. The present study examined the effects of ferro-fluid concentrations and magnetic field implementation on the fluid throughout the boiling process. Obtained are the quenching curve and boiling curve on specified surface roughness in both water and ferro-fluid with two different concentrations. A silver cylinder with Aspect ratio of 10, and surface roughness of 689 nm was heated up to 350 C and then was overwhelmed in the fluid under study. Temperatures were measured by a thermocouple which installed in the center of the cylinder. The test was carried out 5 times. The obtained results depicted that critical heat flux was lower in ferro-fluid compared with water. It was also acquired that in further repetitions of the tests in identical circumstances the quenching time of the sample decreases. Implementing the magnetic field, with specified and constant intensity, resulted in considerable increase in film boiling heat flux. Moreover, because of implementing the magnetic field, ferro particles moved in base fluid which validated by Particle Image Velocimetry (PIV) technique
  5. Keywords:
  6. Film boiling ; Magnetic field ; Nanofluid ; Nucleate boiling ; PIV ; Boiling process ; Field implementation ; Heat transfer rate ; Nanofluids ; Particle image velocimetry technique ; Quenching time ; Aspect ratio ; Cylinders (shapes) ; Evaporation ; Heat flux ; Nucleate boiling ; Quenching ; Surface roughness ; Thermocouples ; Magnetic fields
  7. Source: Applied Thermal Engineering ; Volume 64, Issue 1-2 , March , 2014 , Pages 331-338 ; ISSN: 13594311
  8. URL: http://www.sciencedirect.com/science/article/pii/S1359431113008673