Thesis (Ph. D.)--University of Chicago, Department of Mathematics, June 2000. / Includes bibliographical references. Also available on the Internet.

M.Ing / The geometric shape of a passage's cross-section has an effect on its convective heat transfer capabilities. For concentric annuli, as cross section, the diameter ratio of the annular space plays an important role. The purpose of this investigation was to find a . correlation that will accurately predict heat transfer coefficients at the inner wall of smooth concentric annuli for the flow of water. Experiments were conducted on water under turbulent flow conditions for a wide range of diameter ratios. The Wilson plot method was used to determine the heat transfer coefficients from which a correlation was developed that could be used to predict the heat transfer coefficients. It was found that the correlation predicted Nusselt numbers accurately within 3% of measured values for diameter ratios between a = 1.7 and a = 5.1 and a Reynolds numbers range of 4 000 to 30 000.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Song Hao = 湍流熱對流中的熱傳導測量 / 宋浩. / Thesis submitted in: December 2004. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 65-70). / Text in English; abstracts in English and Chinese. / Song Hao = Tuan liu re dui liu zhong de re zhuan dao ce liang / Song Hao. / Abstract (in English) --- p.i / Abstract (in Chinese) --- p.ii / Acknowledgements --- p.iii / Table of Contents --- p.iv / List of Figures --- p.vi / List of Tables --- p.ix / Chapters / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Experimental Setup and Methods --- p.7 / Chapter 2.1 --- The rough boundary cell / Chapter 2.1.1 --- Convection Cell --- p.7 / Chapter 2.1.2 --- Temperature Probes --- p.9 / Chapter 2.1.3 --- Working Fluids --- p.10 / Chapter 2.1.4 --- Temperature-stabilized Box --- p.12 / Chapter 2.2 --- Rectangular and Square Cell --- p.13 / Chapter 2.3 --- The Big Cell --- p.13 / Chapter 2.4 --- The Thermal Measurements --- p.16 / Chapter 3. --- Nusselt Number Measurement in the Rough Boundary Cell --- p.19 / Chapter 3.1 --- Nu correction --- p.19 / Chapter 3.2 --- Non-Boussinesq Effect --- p.25 / Chapter 3.3 --- Experimental Results --- p.28 / Chapter 3.3.1 --- Water --- p.28 / Chapter 3.3.2 --- 1-Pentonal --- p.29 / Chapter 3.3.3 --- Dipropylene Glycol --- p.30 / Chapter 3.3.4 --- Triethylene Glycol --- p.32 / Chapter 3.4 --- Discussion on the Results --- p.34 / Chapter 3.4.1 --- Nusselt number --- p.34 / Chapter 3.4.2 --- Comparison with the smooth cell --- p.35 / Chapter 3.4.3 --- Normalized Nusselt number enhancement --- p.37 / Chapter 3.4.4 --- Nu~Pr-Relation --- p.40 / Chapter 3.4.5 --- Effects of Roughness Size --- p.43 / Chapter 3.4.6 --- Temperature Fluctuation Measurement --- p.44 / Chapter 4. --- Geometry Dependence of Nusselt Number and Temperature Fluctuation --- p.47 / Chapter 4.1 --- Nusselt Number Measurement --- p.48 / Chapter 4.2 --- Temperature Fluctuation's Dependence on Geometry --- p.50 / Chapter 5. --- Nusselt Number in the Big Cell --- p.53 / Chapter 5.1 --- The Big Cell --- p.53 / Chapter 5.2 --- Correction for Big Cell --- p.57 / Chapter 5.3 --- Results and Discussion --- p.61 / Chapter 6. --- Conclusions --- p.63 / References --- p.65

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Vita. / Digitized by Kansas Correctional Industries

Laminar natural convection heat transfer from the vertical surface of a cylinder is a classical subject, which has been studied extensively. Furthermore, this subject has generated some recent interest in the literature. In the present investigation, numerical experiments were performed to determine average Nusselt numbers for isothermal vertical cylinders (103 < RaL < 109, 0.5 < L/D <10, and Pr = 0.7) with and without an adiabatic top in a quiescent ambient environment which will allow for plume growth. Results were compared with commonly used correlations and new average Nusselt number correlations are presented. Furthermore, the limit for which the heat transfer results for a vertical flat plate may be used as an approximation for the heat transfer from a vertical cylinder was investigated.

The convective fluid-to-particle heat transfer coefficient (hfp ) is one of the critical factors influencing the process design for multi phase food products, in continuous tubeflow systems. Determination of hfp associated with moving particles poses a unique challenge to investigators because of the difficulty in monitoring the temperature of moving particles without interfering with the particle motion. Two different techniques involving particle motion were developed to evaluate hfp and to study the effects of factors influencing hfp, associated with spherical particles under tube-flow conditions. / Spherical Nylon particles with centrally located fine-wire flexible thermocouples, were suspended from the upper mid-section of a curved glass tube in order to provide lateral movement of the particle as the tube was subjected to oscillatory motion. / A full factorial experimental design was studied involving spherical particles made of Aluminum epoxy and Nylon of different diameters (12.7 to 17.5 mm), particle linear velocities (0.06 to 0.21 m/s), heating medium viscosities (0 to 1% Carboxymethyl cellulose, CMC) and fluid temperatures (60 to 80°C). The above factors had a significant (p < 0.001) effect on hfp. Depending on experimental conditions the values of h fp varied from 350 to 2000 W/m2K. Overall, hfp values associated with the aluminum epoxy particle were about 30% higher than that for the Nylon particle. / A calorimetric method was developed to evaluate hfp associated with a freely moving particle. / The calorimetric method was used to evaluate the effect of fluid flow rate, viscosity and temperature, as well as particle size on the associated hfp under tube-flow conditions. Experiments were carried out using different flow rates (9 to 19 L/min), fluid viscosity (0 to 1% CMC solution) and fluid temperature (50 to 70°C) as well as Aluminum spherical particles of different sizes (19 to 25.4 mm). Values of hfp varied from 650 to 2660 W/m2K, and increased significantly (p < 0.001) with an increase in fluid flow rate and particle size, whereas a decrease was observed with CMC concentration and temperature. / Several correlations were developed in the form of Nusselt number as a function of other influencing dimensionless numbers. Nusselt numbers estimated from the developed equations showed good agreement with the experimental data (0.88 < R2 < 0.99). (Abstract shortened by UMI.)

Thesis--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references (p.192-193).

Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2006. / Includes bibliographical references (p. 105-106).