TED-AJ03-644 THE ELECTROHYDRODYNAMIC EFFECT OF AC, DC AND PULSED SQUARE WAVE ELECTRIC FIELDS ON HEAT TRANSFER IN R11
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概要
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The study of the application of electric fields in a fluid that result in a localized fluid movement is called electrohydrodynamics. In heat transfer, this additional motion may cause an increase in convective heat transfer coefficient. This is often manifested as a drop in the surface temperature, so that a drop in surface temperature at a constant heat load can be taken as an indication of an enhancement in the rate of heat transfer. This paper presents the effect of AC (50Hz), DC and pulsed square wave (56Hz) electric fields on heat transfer from a horizontal circular cylinder in Freon 11 (R11) as the dielectric liquid. The experimental rig consist of a 19mm diameter, 75mm long electrically heated copper tube, surrounded by eight brass electrodes 1.6mm in diameter and extending over the full length of the heater. The electrodes and the heater were totally immersed in R11 refrigerant. The DC and AC electric fields were generated by connecting the electrodes to a high voltage power supply. The pulsed square wave electric field was generated by connecting the high voltage power supply to a four-cylinder internal combustion engine distributor, which was rotated by a DC motor. The four outlet cables of the distributor were connected to the brass electrodes. Four thermocouples were located at the top, right, bottom and left at a vertical cross section of the heated tube (Fig. 1). Since a horizontal heating surface is used, therefore the thermal boundary layer thickness around the heating surface will not be uniform, and the effect of electric fields on surface temperature might vary. Thereby in this experiment the effect of electric fields is studied on each individual thermocouple The results show when DC, pulse square wave and AC fields are utilized and the four thermocouples reading were averaged, there were a small or no changes detected in the overall heating surface temperature. When the effect of electric field is studied on each thermocouple individually, differences begin to appear. The results show small temperature drop at the top thermocouple when 6 and 3KV DC, AC and pulse square wave were used. At the horizontal locations no change was detected for the two voltages used (3 and 6kV) and for the three waveforms used (AC, DC and pulse square wave fields). The highest drop in surface temperature occurred at the bottom thermocouple, when a 3KV electric field potential was employed in nucleate boiling regime, AC field caused the highest decrease in surface temperature. However, when the electric field potential is increased to 6KV, both AC and pulse square wave electric field caused an equal decrease in surface temperature at the bottom thermocouple by the same values.[figure]
著者
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MARUYAMA Shigenao
Institute of Fluid Sciences, Tohoku University
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Maruyama Shigenao
Institute Of Fluid Science Tohoko University
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Nasif Mohammad
University Of Technology Sydney Faculty Of Engineering
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Reizes John
University of Technology Sydney Faculty of Engineering
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Madadnia Jafar
University of Technology Sydney Faculty of Engineering
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