Header menu link for other important links
X
Experimental and numerical investigation into the heat transfer study of nanofluids in microchannel
P. V. Harikrishna, ,
Published in
2011
Volume: 133
   
Issue: 12
Abstract
There are very few detailed experimental investigations about the heat transfer behavior of nanofluids in microchannel. The heat transfer behavior of nanofluids in microchannel is investigated. Two microchannels with hydraulic diameters 218 and 303 m are fabricated by wet etching process on silicon wafer. An experimental set-up having provision of flow in the channel and temperature measurement along with bottom wall temperature is built-up. Alumina nanofluids with concentrations of 0.25 vol. % , 0.5 vol. % , and 1 vol. with 45 nm are prepared, stabilized, and characterized by standard methods. The thermal conductivity and viscosity used in the study were measured and analyzed. The base fluids used are water and ethylene glycol. The effect of volume fraction, channel size, particle size, and base fluids are presented and analyzed. An important phenomenon of dispersion is observed. In addition, numerical modeling is carried out by using discrete phase approach. Shear induced particle migration is identified to be the reason of difference for dispersion of particles. The Brownian and thermophoretic forces are responsible for major changes in particle concentration and their movement. Also, it was found that better heat transfer characteristics can be obtained by higher concentration of nanofluids and by low viscous base fluids. © 2011 American Society of Mechanical Engineers.
About the journal
JournalJournal of Heat Transfer
ISSN00221481
Open AccessNo
Concepts (32)
  •  related image
    BOTTOM WALL
  •  related image
    BROWNIAN EFFECT
  •  related image
    CHANNEL SIZES
  •  related image
    DISCRETE PHASE
  •  related image
    DISCRETE PHASE MODELING
  •  related image
    Experimental investigations
  •  related image
    Experimental setup
  •  related image
    Heat transfer behavior
  •  related image
    Heat transfer characteristics
  •  related image
    Hydraulic diameter
  •  related image
    Nanofluids
  •  related image
    Numerical investigations
  •  related image
    Numerical modeling
  •  related image
    Particle concentrations
  •  related image
    PARTICLE MIGRATION
  •  related image
    Standard method
  •  related image
    THERMOPHORETIC FORCE
  •  related image
    WET-ETCHING PROCESS
  •  related image
    Brownian movement
  •  related image
    Dispersions
  •  related image
    Ethylene
  •  related image
    Ethylene glycol
  •  related image
    FLUIDS
  •  related image
    Heat transfer
  •  related image
    Investments
  •  related image
    Microchannels
  •  related image
    Semiconducting silicon compounds
  •  related image
    Silicon wafers
  •  related image
    Temperature measurement
  •  related image
    Thermal conductivity
  •  related image
    Wet etching
  •  related image
    Nanofluidics