M. M. Yovanovich

University of Waterloo

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J. R. Culham

University of Waterloo

106

Y. S. Muzychka

Memorial University of Newfoundland

Waqar A. Khan

Saveetha University

P. Teertstra

University of Waterloo

Majid Bahrami

Pacific Institute for Climate Solutions

G. E. Schneider

University of Waterloo

M Sridhar

General Electric (India)

T.F. Lemczyk

University of Waterloo

S. Lee

University of Waterloo

K.J. Negus

Montana Technological University

Cooperative Institutions

University of Waterloo

Massachusetts Institute of Technology

Bhabha Atomic Research Centre

American Society of Mechanical Engineers

Atomic Energy (Canada)

Texas A&M University

Japan Atomic Energy Agency

Poughkeepsie Public Library District

University of Minnesota

General Electric (United States)

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Role of Random Roughness on Thermal Performance of Microfins

Journal of Thermophysics and Heat Transfer (2006)

Majid Bahrami M. M. Yovanovich J. R. Culham

Heat transfer in rough circular cylinder microfins is studied and a novel analytical model is developed. Surface roughness is assumed to posses a Gaussian isotropic distribution. It is shown that, as a result of roughness, both cross-sectional and surface areas are increased. As a result, an enhancement is observed in the heat transfer rate and thus the thermal performance of microfins. The present model can be implemented to analyze other geometries such as rectangular and tapered microfins.

10.2514/1.22353

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Citations (17)

Thermal analysis of trapezoidal grooved heat pipe evaporator walls

30th Thermophysics Conference (1976)

Gerhard Schneider M. M. Yovanovich V. A. Wehrle

10.2514/6.1976-481

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Citations (8)

Modeling the effect of air and oil upon the thermal resistance of a sphere-flat contact

30th Thermophysics Conference (1973)

M. M. Yovanovich W. KITSCHA

Contact resistance

10.2514/6.1973-746

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Citations (9)

Pressure Drop in Laminar Developing Flow in Noncircular Ducts: A Scaling and Modeling Approach detailed review and analysis of the hydrodynamic characteristics of laminar developing

Y. S. Muzychka M. M. Yovanovich

and fully developed flows in noncircular ducts is presented. New models are proposed, which simplify the prediction of the friction factor‐Reynolds product f Re for developing and fully developed flows in most noncircular duct geometries found in heat exchanger applications. By means of scaling analysis it is shown that complete problem may be easily analyzed by combining the asymptotic results for the short and long ducts. Through the introduction of a new characteristic length scale, the square root of cross-sectional area, the effect of duct shape has been minimized. The new model has an accuracy of 10% or better for most common duct shapes when nominal aspect ratios are used, and 3% or better when effective aspect ratios are used. Both singly and doubly connected ducts are considered. DOI: 10.1115/1.4000377

Flow conditioning

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Thermal Spreading Resistance in Multilayered Contacts: Applications in Thermal Contact Resistance

Journal of Thermophysics and Heat Transfer (1999)

Y. S. Muzychka M Sridhar M. M. Yovanovich Vincent W. Antonetti

Application of highly conductive coatings to contacting surfaces is a commonly employed method to enhance thermal contact conductance. In many applications it is often necessary to apply an intermediate coating such that the conductive coating may be applied to a nonadhering substrate. In these instances, it is desirable to predict the effect that the intermediate and final coatings have on the spreading resistance. A solution for computing the thermal spreading resistance of a planar circular contact on a doubly coated substrate is presented. Also, a model is developed to compute the contact conductance between a bare substrate and a coated substrate. Comparisons are made with data obtained in the literature for which no analytical model was available. Solution of the governing equations and numerical computation of the spreading resistance were obtained using computer algebra systems

Contact resistance

Interfacial thermal resistance

Thermal contact

10.2514/2.6466

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Citations (32)

Review of Thermal Conductance Models for Joints Incorporating Enhancement Materials

Journal of Thermophysics and Heat Transfer (2003)

I. Savija J. R. Culham M. M. Yovanovich E. E. Marotta

A comprehensive review of analytical and empirical models for calculating the thermal conductance across mechanically formed joints is presented. A historical perspective of modeling procedures for a range of interface cone gurations is presented, including barecontacting surfaces for conforming rough surfaces aswell as interfacial surfaces augmented with enhancement materials such as greases, metallic foils, polymeric compliant materials, e lms, and coatings. Given the wide range of interface materials available and their associated thermophysical and surface properties, the models presented provide an effective procedure for determining the signie cance of these properties in the prediction of contact, gap, and overall joint conductance.

10.2514/2.6732

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Citations (84)

Thermal Gap Conductance of Conforming Surfaces in Contact

Journal of Heat Transfer (1993)

Sang Min Song M. M. Yovanovich F. O. Goodman

Heat transfer through gas layers of contact interfaces formed by two microscopically rough surfaces is studied. Rarefied gas conduction between smooth parallel plates is examined with data obtained from the literature. Two important dimensionless parameters are introduced; one representing the ratio of the rarefied gas resistance to the continuum gas resistance, and the other representing gas rarefaction effects. Effects of gas rarefaction and surface roughness are studied in relation to the parallel plates case. It is proposed that the effective gap thickness at light loads may be estimate by a roughness parameter, the maximum peak height Rp. Experiments were performed to measure gap conductance for a number of Stainless Steel 304 pairs and Nickel 200 pairs over a range of roughnesses and gas pressures. Three different types of gases, helium, argon, and nitrogen, were employed as the interstitial gas. The comparison between the theory and the measured values of gap conductance shows excellent agreement.

Dimensionless quantity

Rarefaction (ecology)

Nitrogen gas

10.1115/1.2910719

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Citations (65)

Investigation of the effect of metallic foils upon thermal joint resistance - Evidence of optimum foil thickness

30th Thermophysics Conference (1972)

M. M. Yovanovich

10.2514/6.1972-283

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Citations (10)

Natural Convection Inside Vertical Isothermal Ducts of Constant Arbitrary Cross Section

Journal of Thermophysics and Heat Transfer (2002)

M. M. Yovanovich P. Teertstra Y. S. Muzychka

A model for steady laminar natural convection inside vertical, arbitrarily shaped isothermal ducts of constant cross section is presented. The model is based on a combination of asymptotic solutions for fully developed and developing, boundary-layer e ow. The fully developed asymptote model utilizes forced convection, internal e ow modeling techniques, and an approximate model is presented, which is valid for a wide range of duct shapes and aspectratios.Themodelisvalidated usingexperimentaldataandnumericalresultsfrom theliteratureforavariety of duct shapes, including the triangle, square, circle, rectangle and the special case of parallel plates. The model is in good agreement with all of the data, with an rms percent difference of 10% or less in most cases.

Constant (computer programming)

Isothermal process

Section (typography)

10.2514/2.6660

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Citations (14)

16. Thermal contact conductance in a vacuum

Vacuum (1967)

M. M. Yovanovich

10.1016/0042-207x(67)92548-1

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Citations (11)