Abstract
This study analyzes the characteristics of alumina (Al2O3)/water nanofluid to determine the feasibility of its application in an air-cooled heat exchanger for heat dissipation for PEMFC or electronic chip cooling. The experimental sample was Al2O3/water nanofluid produced by the direct synthesis method at three different concentrations (0.5, 1.0, and 1.5 wt.%). The experiments in this study measured the thermal conductivity and viscosity of nanofluid with weight fractions and sample temperatures (20-60°C), and then used the nanofluid in an actual air-cooled heat exchanger to assess its heat exchange capacity and pressure drop under laminar flow. Experimental results show that the nanofluid has a higher heat exchange capacity than water, and a higher concentration of nanoparticles provides an even better ratio of the heat exchange. The maximum enhanced ratio of heat exchange and pressure drop for all the experimental parameters in this study was about 39% and 5.6%, respectively. In addition to nanoparticle concentration, the temperature and mass flow rates of the working fluid can affect the enhanced ratio of heat exchange and pressure drop of nanofluid. The cross-section aspect ratio of tube in the heat exchanger is another important factor to be taken into consideration.
Highlights
As technology and energy products require higher standards of function and performance, the problem of heat dissipation is becoming a significant issue in many appliances
Identifying the differences in nanofluid weight fractions, mass flow rates, and temperature effects on heat exchange performance and pressure drop of the air-cooled heat exchanger makes it possible to evaluate the feasibility of applying Al2O3/ water nanofluid to proton exchange membrane fuel cell (PEMFC) heat dissipation or electronic chip cooling in the future
Experimental procedure and design This study investigates whether the Al2O3/water nanofluid can be used for PEMFC heat dissipation or electronic chip cooling in the future
Summary
As technology and energy products require higher standards of function and performance, the problem of heat dissipation is becoming a significant issue in many appliances. They used nanofluid Al2O3/water and TiO2/ water nanofluid under turbulent flow conditions to investigate the effects of the Peclet number, volume concentration of suspended particles, and particle type on heat transfer characteristics Their results indicate that the addition of nanoparticles to the base fluid enhances heat transfer performance. Identifying the differences in nanofluid weight fractions, mass flow rates, and temperature effects on heat exchange performance and pressure drop of the air-cooled heat exchanger makes it possible to evaluate the feasibility of applying Al2O3/ water nanofluid to PEMFC heat dissipation or electronic chip cooling in the future. The uncertainty of the heat exchange capacity experiment was calculated to be less than ± 3.3%
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