Local heat transfer on the entrance segment of a tube with a sharp inlet edge. 2. Correction for the entrance segment under turbulent boundary layer conditions

Legkii, V. M.; Rogachev, V. A.

doi:10.1007/bf00861532

Cited by 2 publications

(2 citation statements)

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“…Further experiments prove that it is better to use the Launder-Spalding model for a channel formed by smooth solid fins. However, these models can not predict the tearing currents [51][52][53][54], which appear in the cut fins when the sections are rotated against the oncoming flow.…”

Section: Analysis Of the Results Of Numerical Studiesmentioning

confidence: 99%

“…4c show an enlarged cross section of the experimental model of the area near the fin wall, which was modeled using the inflation function. The inflation function is used to model adjacent layers that develop under the conditions of separating currents occurring on the surfaces of the initial sections of the interfin channels [51][52][53][54]. However, one must also take into account that during the physical experiment, the heating surface is located in an aerodynamic tube [55,56], and for this reason it is also necessary to simulate the forming of the adjacent layer on the upper plane of the calculated area (Fig.…”

Section: Calculated Area and Computational Gridmentioning

confidence: 99%

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Archives of Thermodynamics

Nikolaenko,

Baranyuk,

Rohachov

et al. 2020

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Promising cooling systems for high-power electronic elements are those based on vapor chambers and heat pipes which allow for the local heat flow to be dispersed from the electronic element to a larger surface area of the vapor chamber or the heat pipe. To reduce the thermal resistance of the cooling system, a finned radiator is installed on the outer surface of the vapor chamber or heat pipe. The authors propose a new design of the radiator which increases the heat transfer efficiency. The paper presents results of numerical simulation of heat transfer and aerodynamic resistance of the heat transfer surface with lamellar-split finning. The comparative analysis of heat transfer and aerodynamics was carried out for three types of radiators: with lamellar smooth finning, with lamellar split finning and with the sections of split finning rotated 30 • against the air flow. It is shown that cutting the fins and rotating the split sections leads to an increase in heat transfer intensity and increase in aerodynamic resistance. The obtained results may be useful in the design of cooling systems for computer processors, power amplifiers for transmitting modules, energy-saving solid-state light sources, etc.

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Section: Analysis Of the Results Of Numerical Studiesmentioning

confidence: 99%

Section: Calculated Area and Computational Gridmentioning

confidence: 99%