Solar Engineering Of Thermal Processes

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Numerical Heat Transfer And Fluid Flow

Phase change materials for thermal energy storage

Applied Numerical Analysis. By C.F. Gerald. Pp. xii, 340. £3·60. 1970. (Addison-Wesley.)

Wall-bounded turbulent flows at high Reynolds numbers have become an increasingly active area of research in recent years. Many challenges remain in theory, scaling, physical understanding, experimental techniques, and numerical simulations. In this paper we distill the salient advances of recent origin, particularly those that challenge textbook orthodoxy. Some of the outstanding questions, such as the extent of the logarithmic overlap layer, the universality or otherwise of the principal model parameters such as the von Karman “constant,” the parametrization of roughness effects, and the scaling of mean flow and Reynolds stresses, are highlighted. Research avenues that may provide answers to these questions, notably the improvement of measuring techniques and the construction of new facilities, are identified. We also highlight aspects where differences of opinion persist, with the expectation that this discussion might mark the beginning of their resolution.

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Wall-bounded turbulent flows at high Reynolds numbers: Recent advances and key issues

Analytical and experimental studies on the thermal performance of cross-corrugated and flat-plate solar air heaters

Numerical simulation of three-dimensional flow dynamics in a hot water storage tank

http://amet-me.mnsu.edu/UserFilesShared/SolarWall/Technical%20Papers%20and%20%20Documents/Flat%20Plate%20Collector/A%20parametric%20study%20on%20the%20thermal%20performance%20of%20cross-corrugated%20solar%20air%20collectors%20-%20Wenxian%20Lin,%20Wenfeng%20Gao,%20Tao%20Liu.pdf

A parametric study on the thermal performance of cross-corrugated solar air collectors

Direct simulation of natural convection cooling in a vertical circular cylinder

The weak axisymmetric fountain that results from the injection of a dense fluid upwards into a large container of homogeneous fluid of lower density is studied numerically. Using a time-accurate finite volume code, the behaviour of fountains with both a uniform and a parabolic profile of the discharge velocity at the source have been investigated. The evolution of the transient fountain flow has been analysed and two distinct stages of evolution have been identified. The time series of the passage of the fountain front has been presented and the initial, temporary and final characteristic fountain heights have been determined and scaled with the Froude number at the source. At steady state, the final fountain height and the fountain width are found to be the height and horizontal length scales which provide the full parameterization of the fountain flow in the fountain core. The vertical velocity and temperature on the symmetry axis have been
scaled with the height scale and an explicit correlation is also obtained for the former. The radial distributions of both the vertical and horizontal velocities in the zone of self similarity in the fountain core at steady state have been scaled with the two length scales and empirical correlations have been obtained.

/pdf/direct-simulation-of-weak-axisymmetric-fountains-in-a-3ouran4b0a.pdf

Wenxian Lin

Papers

Analytical and experimental studies on the thermal performance of cross-corrugated and flat-plate solar air heaters

Numerical simulation of three-dimensional flow dynamics in a hot water storage tank

A parametric study on the thermal performance of cross-corrugated solar air collectors

Direct simulation of natural convection cooling in a vertical circular cylinder

Direct simulation of weak axisymmetric fountains in a homogeneous fluid