Graduate Thesis Or Dissertation
 

Turbulent mixing across adjacent subchannels in packed rod bundles using conductivity measurement

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  • Turbulent mixing across adjacent subchannels in packed rod bundles was studied using conductivity measurement and sodium chloride solution as the tracer. Single phase water was the fluid investigated. The packed rod bundles were seven stainless steel tubes, 1.905 cm in diameter and 152.4 cm long, arranged in hexagonal close-packed configuration and housed inside a 7.551 cm acrylic plastic tube. The geometric configuration enabled simultaneous investigation of turbulent mixing between triangular-triangular, triangular-trapezoidal and trapezoidal-trapezoidal channels. A set of coupled differential equations describing the mass transport between adjacent channels in rod bundles was written using the "lumped-parameter" approach which treated the large intersticies between the rods as the differential elements. The channel lumping technique resulted in a 4-channel model and a 2-channel model, reducing the number of differential equations that had to be investigated. A modified matrix method, made possible by successive data collected, was used in evaluating the crossflow mixing coefficients. The flow rate of water covered a range from 1000 cm³ to 5000 cm³. The gap spacing studied was 0.47 cm. The Reynolds number covered was from 6 x 10³ to 2.5 x 10⁴. The following were the result of the investigation: 1) The probe and the conductivity measurement is a very promising means of tracer technique if some improvement is made on the data-taking scheme. 2) The modified matrix technique evaluates the crossflow mixing coefficient directly from the input and output concentration data, provided there is very little or no error associated with the concentration data. 3) The turbulent mixing coefficient is shown to be a strong function of the subchannel Reynolds number. 4) Comparison with the works of the previous investigator shows that the turbulent mixing coefficient is not a strong function of gap spacing, it is indistinguishable within statistical significance. 5) The turbulent mixing coefficient is shown to be a weak function of subchannel geometry.
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