Yu has authored or coauthored more than fifty publications and holds six patents.
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Home Subjects Nanotechnology General Nanomaterials. Science and Technology Sarit K. Choi, Wenhua Yu, T. Added to Your Shopping Cart. Description Introduction to nanofluids--their properties, synthesis, characterization, and applications Nanofluids are attracting a great deal of interest with their enormous potential to provide enhanced performance properties, particularly with respect to heat transfer.
In the glass tube, the fluid flows over the surface of the heater rod. Two pressure transducers are installed at both ends of the test section to measure the pressure drop along the tube. Static pressure at the inlet and the outlet of the test section are measured using Keller make pressure sensors which have a range of 1—10 bar with an accuracy of. The pressure drop in single-phase flow and two-phase flow of nanofluids was measured. Measured data including pressures and temperatures are recorded by a data acquisition system Omega, OMB-DAQ which is connected to a computer.
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Temperatures at the inlet and the outlet of the test section and the heater surface were measured with J-type ungrounded thermocouples. Temperatures at various locations on the surface of the heater rod were measured using five miniature thermocouples which were embedded on it.
All the thermocouples were connected to the data acquisition system. A hollow pipe of stainless steel was fitted in the place of test section to clean the experimental test fluid loop with The experimented test section was used to measure surface roughness separately. A new heater rod of test section was cleaned with very fine grade P sand paper to maintain similar surface characteristics of the test surface. The experimental boundary conditions and results of uncertainty analysis for measured parameters are shown in Tables 1 and 2 , respectively.
The experimental uncertainty of the present work was determined by ASME guidelines on uncertainties in experimental measurements in multiphase flow [ 22 ].
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The following procedure was adopted for conducting the experiment. This process was repeated times before each experiment until no bubbles were observed.
Nanofluids: Science and Technology
Here heat flux calculated as joule power divided by area; and the surface temperature, and the bulk temperature, measured at the steady-state condition by ensuring that temperatures of all the thermocouples have become steady. The surface temperature, was the average of all the five imbedded thermocouples. Experimental data in Figure 4 shows heat transfer coefficient of distilled water. Results show that heat transfer increases with heat flux for all pressures due to increased energy gain by the water.
Experimental data in Figures 5 , 6 , 7 , and 8 shows heat transfer coefficient of 0. Results show that heat transfer increases with heat flux for all concentrations of ZnO-water nanofluids due to increased energy gain by the nanoparticles, which is in similar trend with previous researches [ 20 ].
Nanofluids Science and Technology - 9780470074732
The increase in heat transfer coefficient was significant at 0. The heat transfer coefficient also increased with applied pressure because at higher pressure effective cooling of heater rod was observed possibly due to increased Brownian motion, particle driven natural convection and conduction, between nanoparticles via more force applied at same heating area. Figure 9 shows pressure drop bar in an annular test section for different ZnO-water nanofluid with varying concentration of ZnO.
There was no significant pressure drop observed at lower concentrations; however at higher concentrations 0. Figure 10 shows that the surface roughness, Ra m , of heater rod for ZnO-water nanofluid increases gradually with increase in concentration of ZnO particles in the nanofluid because of deposition of nanoparticles on heating surface area.
An experimental facility was developed to study heat transfer characteristics of ZnO-water nanofluid.
Preparation and thermal conductivity of CuO nanofluid via a wet chemical method
The working fluid was electrically heated in horizontal annular test section. All the instruments in test setup were properly calibrated as per guidelines given by American Society of Mechanical Engineers.
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Flow boiling heat transfer experiments in subcooled region were carried out to study heat transfer characteristics of ZnO-water nanofluid. The results of the present investigation are summarized as follows. The authors declare that there is no conflict of interests regarding the publication of this paper.
The guidance by Late Professor A. Science and Technology of Nuclear Installations. Indexed in Science Citation Index Expanded. Subscribe to Table of Contents Alerts. Table of Contents Alerts. It accordingly comprises a few uncomplicated details describing conduction, convection, and boiling of nanofluids for these readers who won't have sufficient historical past in those parts.
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