Design criteria for ribbed channels: Experimental investigation and theoretical analysis

Facchini, Bruno; Innocenti, Luca; Surace, Marco

doi:10.1016/j.ijheatmasstransfer.2006.02.026

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Their investigation encompassed the effect of the channel aspect ratio, angle of attack, and flow parameters. Facchini et al [76] experimentally investigated Nu and f in flows through rectangular air channels with different aspect ratios for the baffles used to roughen the channel, with a baffle angle of 60 . They observed that Nu increased sharply at a low Re and remained constant for higher values of Re.…”

Section: Baffles Used As Roughness Turbulence Promoters In Solar Air mentioning

confidence: 99%

Convective heat transfer enhancement in solar air channels

Kumar

Kim

2015

Applied Thermal Engineering

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Section: Baffles Used As Roughness Turbulence Promoters In Solar Air mentioning

confidence: 99%

Convective heat transfer enhancement in solar air channels

Kumar

Kim

2015

Applied Thermal Engineering

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“…Facchini et al [29] presented an experimental study of heat transfer in ribbed channels in the turbine blade cooling system at the entrance region. Thermochromic liquid crystals were sprayed on one surface of the channel.…”

Section: Solution Of 1d Unsteady Heat Conduction In a Semi-infinite Wallmentioning

confidence: 99%

Heat Transfer Coefficient Distribution—A Review of Calculation Methods

Duda

2023

Energies

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Determination of the heat transfer coefficient (HTC) distribution is important during the design and operation of many devices in microelectronics, construction, the car industry, drilling, the power industry and research on nuclear fusion. The first part of the manuscript shows works describing how a change in the coefficient affects the operation of devices. Next, various methods of determining the coefficient are presented. The most common method to determine the HTC is the use of Newton’s law of cooling. If this method cannot be applied directly, there are other methods that can be found in the open literature. They use analytical formulations, the lumped thermal capacity assumption, the 1D unsteady heat conduction equation for a semi-infinite wall, the fin model, energy conservation and the analogy between heat and mass transfer. The HTC distribution can also be calculated by means of computational fluid dynamics (CFD) modelling if all boundary conditions with fluid and solid properties are known. Often, the surface on which the HTC is to be determined is not accessible for any measuring sensors, or their installation might disturb the analysed phenomenon. It also happens that calculations using direct or CFD methods cannot be performed due to the lack of required boundary conditions or sufficiently proven models to analyse the considered physical phenomena. Too long a calculation time needed by CFD tools may also be problematic if the method should be used in the online mode. One way to solve the above problem is to assume an unknown boundary condition and include additional information from the sensors located at a certain distance from the investigated surface. The problem defined in this way can be solved by inverse methods. The aim of the paper is to show the current state of knowledge regarding the importance of the heat transfer coefficient and the variety of methods that can be used for its determination.

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“…Bruno Facchini et al (2006) Image processed data makes available quantitative, full-field information about the distribution of temperature and heat transfer coefficient which will undoubtedly encourage the study of situations which have been, until now, too complex to consider.…”

Section: Literature Reviewmentioning

confidence: 99%

Measurement of Local Convective Heat Transfer Coefficient of an Artificialroughened Duct by Using Liquid Crystal Thermography (LCT) Technique

Lalit¹,

Aharwal²,

Jaiswal³

2014

ujme

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The heat transfer from surfaces may in general be enhanced by increasing the heat transfer coefficient between a surface and its surroundings, and by increasing the heat transfer area of the surface, or by both. In most cases the heat transfer is concerned with the application of artificial surface roughness techniques as a turbulence promoter for convective heat transfer enhancement. To measure the transient and local convective heat transfer coefficient of an artificial roughened duct using liquid crystal thermography (LCT) technique, an experimental setup have been designed and developed. The aspect ratio of duct was maintained as three with relative roughness height ratio (e/D) of 0.13 and angle of attack is 900 for the range of Reynolds number from 7000 to 17500.

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Design criteria for ribbed channels: Experimental investigation and theoretical analysis

Cited by 7 publications

References 15 publications

Convective heat transfer enhancement in solar air channels

Convective heat transfer enhancement in solar air channels

Heat Transfer Coefficient Distribution—A Review of Calculation Methods

Measurement of Local Convective Heat Transfer Coefficient of an Artificialroughened Duct by Using Liquid Crystal Thermography (LCT) Technique

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