Graduate Thesis Or Dissertation
 

Natural and forced turbulent mixing in rod bundles

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fj2364753

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  • The effects of mass flow rate and subchannel configuration on the turbulent interchange between adjacent subchannel in simulated rod bundle were investigated. The simulated rod bundle was made by arranging seven 1.913 cm diameter acrylic plastic rods in an equilateral triangular pattern in a tube 8.89 cm inside diameter. The overall test section was 152.4 cm in length with a 60.96 cm long mixing section. Design of the test section allowed a study of turbulent lateral mixing between triangular-triangular, triangular-trapezoidal and trapezoidal-trapezoidal subchannels configuration. A tracer technique was used with Rhodamine B dye as tracer. Dye concentration was measured with two sets of hypodermic needles. The tracer initially injected in one of the adjacent subchannels was free to diffuse into the other subchannels. Using a lumped parameter approach, an analytical model was developed to describe axial change of concentration along the test section. Measured concentration and subchannel mass flow rate were used for numerical calculation of turbulent mixing rate. Turbulent mixing rate in the rod bundle with wire wrap was also investigated. Following are the results of this study: 1. Turbulent mixing is a function of the subchannel mass flow rate, and increases when subchannel Reynolds number increases. 2, Turbulent mixing is not significant function of the subchannel configuration. 3. Subchannel mixing can be compared to turbulent mixing in the turbulent core of a fluid flowing in a circular tube. 4. The flow conditions in the vicinity of the gap space are very important, especially when mean velocities in adjacent subchannels are not equal. 5. The friction factor for the rod bundle matrix with smooth rods follows Blasius' equation. 6. Wire wraps on the rods increased mixing especially for the higher Reynolds numbers.
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