Author
R.I. Vachon
Bio: R.I. Vachon is an academic researcher from Auburn University. The author has contributed to research in topics: Thermal conductivity & Boundary layer. The author has an hindex of 5, co-authored 7 publications receiving 661 citations.
Papers
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TL;DR: In this article, a theoretical technique to predict the thermal conductivity of heterogeneous solid mixtures has been developed, which does not require experimental data on the mean and standard deviations of the one dimensional porosity function describing the distribution of the discontinuous phase as is the case with Tsao's model.
337Â citations
TL;DR: In this paper, the effect of free-stream turbulence on heat transfer from heated cylinders placed normal to an air stream was investigated and a correlation equation was presented that enables the stagnation point heat transfer as a function of turbulence intensity to be determined.
141Â citations
TL;DR: In this paper, a theoretical technique to predict the thermal conductivity of heterogeneous mixtures, previously derived by the writers, has been applied to suspensions, emulsions and porous materials.
103Â citations
TL;DR: In this paper, two models are developed to describe the effective thermal conductivity of randomly packed granular systems based on a one dimensional Ohm's Law method, and an empirical factor has been obtained to account for three dimensional thermal effects.
91Â citations
TL;DR: In this article, the Patankar/Spalding finite difference solution procedure has been modified to account for the transport of radiant energy in a turbulent optically thin boundary layer.
9Â citations
Cited by
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TL;DR: In this paper, the authors modified the Maxwell equation for the effective thermal conductivity of solid/liquid suspensions to include the effect of this ordered nanolayer, which has been shown to have a major impact on nanofluid thermal conductivities when the particle diameter is less than 10 nm.
Abstract: Nanofluids, a new class of solid/liquid suspensions, offer scientific challenges because their measured thermal conductivity is one order of magnitude greater than predictions. It has long been known that liquid molecules close to a solid surface form layered solid-like structures, but little is known about the connection between this nanolayer and the thermal properties of the suspensions. Here, we have modified the Maxwell equation for the effective thermal conductivity of solid/liquid suspensions to include the effect of this ordered nanolayer. Because this ordered nanolayer has a major impact on nanofluid thermal conductivity when the particle diameter is less than 10 nm, a new direction is indicated for development of next-generation coolants.
1,523Â citations
TL;DR: In this article, the fundamental design principles of highly thermally conductive composites were discussed and the key factors influencing the thermal conductivity of polymers, such as chain structure, crystallinity, crystal form, orientation of polymer chains, and orientation of ordered domains in both thermoplastics and thermosets were addressed.
1,359Â citations
TL;DR: In this article, a modification of the original theories of Rayleigh and Maxwell permitted the deriva tion of expressions for the effective thermal conductivity of composites consisting of a continuous matrix phase with dilute concentrations of dispersions with spherical, cylin drical and flat plate geometry with a thermal barrier resistance at the interface between the components.
Abstract: A modification of the original theories of Rayleigh and Maxwell permitted the deriva tion of expressions for the effective thermal conductivity of composites consisting of a continuous matrix phase with dilute concentrations of dispersions with spherical, cylin drical and flat plate geometry with a thermal barrier resistance at the interface between the components.
1,185Â citations
TL;DR: In this paper, the authors present an exhaustive review of the literature in this area and suggest a direction for future developments, including heat transfer, material science, physics, chemical engineering and synthetic chemistry.
Abstract: Suspended nanoparticles in conventional fluids, called nanofluids, have been the subject of intensive study worldwide since pioneering researchers recently discovered the anomalous thermal behavior of these fluids. The enhanced thermal conductivity of these fluids with small-particle concentration was surprising and could not be explained by existing theories. Micrometer-sized particle-fluid suspensions exhibit no such dramatic enhancement. This difference has led to studies of other modes of heat transfer and efforts to develop a comprehensive theory. This article presents an exhaustive review of these studies and suggests a direction for future developments. The review and suggestions could be useful because the literature in this area is spread over a wide range of disciplines, including heat transfer, material science, physics, chemical engineering and synthetic chemistry.
1,069Â citations
TL;DR: In this paper, heat transfer characteristics of single and multiple isothermal turbulent air and flame jets impinging on surfaces are reviewed, and the effect of crossflow on impingement heat transfer is included.
935Â citations