EXPERIMENTAL STUDY ON HEAT TRANSFER ENHANCEMENT OF FLUID FLOW INSIDE INTERNALLY FINNED PIPE BY THE USE OF MAGNETIC PARTICLE SUSPENSIONS IN PULSATING FLOW
Keywords:
gamma-typed iron oxides, surface heat flux, magnetic field, pulsating flow, heat transfer rate, average heat transfer coefficientsAbstract
The method for increasing the rate of heat transfer is presented in this experimental study using the suspensions of magnetic particles which are composed of γ-Fe2O3 magnetic particles (gamma-typed iron oxides) ranging in average diameter size 10-20 nm dispersed in distilled water. At different volume concentrations of 0.50%, 0.75%, 1% and 1.25%, the experiments were conducted in a vertical, internally finned pipe. To increase the heat transfer rate, three different intensities of external magnetic field 800 Gauss (G), 1,600 G, and 2,400 G were applied during the pipe flow experiments. All tests were performed within the Reynolds number (Re ~ 2,900-9,800). The outside surface area of the copper pipe was directly applied by the uniform surface heat flux during heat transfer experiments. As the volume concentration of the magnetic particles and the external magnetic field intensity increased, the average heat transfer coefficients increased. The maximum increase in heat transfer rate can be gained at particle volume concentration of 1.25% and the strength of external magnetic field of 2,400 G as compared to the base case with no application of the external magnetic field (0 G). The pulsating flow with high frequency is another factor which can increase the heat transfer rate in the pipe flow. At the frequency of 15 Hz, considerable amount of heat transfer rate can be attained.
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