Paper Information

Journal:   MECHANICAL ENGINEERING SHARIF (SHARIF: MECHANICAL ENGINEERING)   FALL 2015 , Volume 31-3 , Number 2; Page(s) 59 To 66.
 
Paper: 

EXPERIMENTAL STUDY ON FORCE CONVECTION OF A NANOFLUID IN A SPIRAL TUBE

 
 
Author(s):  TAJIK JAMAL ABAD M., ZAMZAMIAN A.*, PAZOUKI M.
 
* RENEWABLE ENERGY ENGINEERING MERC
 
Abstract: 

Fluid heating and cooling are important in many industries such as power, manufacturing, transportation, and electronics Eective cooling techniques are greatly needed for cooling any sort of high-energy device. Common heat transfer fluids, such as water, ethylene glycol and engine oil, have limited heat transfer capabilities due to their low heat transfer properties, and numerous researchers have been investigating better ways to enhance the thermal performance of heat transfer fluids. Nano fluids are suspensions of nanoparticles in base fluids; a new challenge for thermal sciences provided by nanotechnology. The tested fluids are prepared by dispersing the Al and Cuor metal base fluids into the water at three dierent concentrations;500, 1000 and 2000 ppm.
Thermal conductivities of these fluids are measured experimentally by a thermal property analyzer, i.e., KD2 Pro, using a KS-1 sensor needle, as this needle is preferred for low viscosity fluids. Experimental results show that the thermal conductivity of nano fluids is higher than base fluid and the thermal conductivity of Cu/Water nano fluid is more than Al/Water nano fluid. This is because Cu-metal thermal conductivity is more than Al-metal thermal conductivity. In addition, a comparison is made between the experimental results of thermal conductivity and the results calculated using the models presented for their prediction.
This study presents the heat transfer coe cient and friction factor of Al-water and Cu-water nano fluids owing in a spiral coil in the laminar ow regime with constantwall temperature. The experiments were undertaken atdierent concentrations and under various operational conditions. The eects of dierent parameters, such as Gz number, wall temperature and nano fluid particle concentration, on the heat transfer coecient and pressure drop of the ow were studied. The thermal conductivities of these fluids are measured experimentally and results show that the thermal conductivity of Cu-Water nano zid is about 18% higher than Al-Water nano fluid in 2000 ppm. Nusselt number oscillations can be seen for dierent nano fluids, which are caused by the secondary ow.

 
Keyword(s): SPIRAL COIL, NANO FLUID, NUSSELT NUMBER, PRESSURE DROP, THERMAL CONDUCTIVITY
 
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