Development of flat-plate thermal and velocity boundary layers under highly turbulent and instable air flows: Reynolds numbers ranging from 8400 to 127000

Kondjoyan, Alain; Péneau, Frédéric; Boisson, H. C.

doi:10.1016/j.ijthermalsci.2004.02.024

Cited by 9 publications

(3 citation statements)

References 16 publications

(37 reference statements)

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“…Streaks develop in the wall layer which led to the production of turbulence very close to the wall. The turbulence production and the effect of Tu on temperature and velocity profiles have been validated experimentally [33]. These investigations give an idea of the mechanisms which can explain the effect of free-stream turbulence on transfer coefficients and comfort the theoretical structure of relation (2).…”

Section: Calculations Of Heat Transfer Coefficient Using Cfd Modelsmentioning

confidence: 88%

A review on surface heat and mass transfer coefficients during air chilling and storage of food products

Kondjoyan¹

2006

International Journal of Refrigeration

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Heat and mass transfer coefficients are needed for the mathematical simulation of air chilling and storage of solid food products. Average transfer coefficient values and distributions around cylinders are now quite well known while it is not the case for solids of more complex shapes. CFD models are more and more often used to calculate transfer coefficient values on a single food product or packaging. Experimental knowledge is reviewed and the way it can be used by scientists and engineers to determine their own transfer coefficient values is illustrated. The potentials and limitations of present CFD models are illustrated and future improvements are also discussed.

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Section: Calculations Of Heat Transfer Coefficient Using Cfd Modelsmentioning

confidence: 88%

A review on surface heat and mass transfer coefficients during air chilling and storage of food products

Kondjoyan¹

2006

International Journal of Refrigeration

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“…Both laminar and turbulent boundary layer flows were considered and the three term asymptotic solution was compared with the numerical solution of the governing equation. Kondjoyan et al (2004) described the effect of highly turbulent air flows on the development of a flat-plate boundary layer at Reynolds numbers ranging from 8400 to 127000. Radmehr and Patankar (2001) proposed two independent solution approaches to compute the transition boundary layer using low-Reynolds-number turbulence models: (1) to solve the boundary layer equations over a flat plate with the starting location of calculation very close to the leading edge of the plate, and (2) to solve the elliptic Navier-Stokes equations over the whole plate, including the leading edge and some region upstream of it.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

An Integral Energy Equation Model for Heat Convection to Turbulent Boundary Layer on a Flat Plate

Khademi¹,

Mozafari²

2016

Frontiers in Heat and Mass Transfer

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An integral energy equation model is used to calculate the heat transfer coefficient/Nusselt number, thermal boundary layer thickness and temperature distribution in the turbulent boundary layer for forced convection over a smooth flat plate. The proposed model is based on two polynomial temperature profiles in a thermal laminar sublayer as well as in a fully developed boundary layer and two integral energy equations. The performance of this new model is compared with the most commonly used semi-empirical correlations and the complex established models such as k-ε, k-ω, RSM, and a good agreement is achieved.

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“…Nan et al [11] conducted an experimental study to investigate the turbulent flow over a horizontal flat plate. Kondjoyan et al [12] performed an experimental study to see the effect of free stream turbulence intensity on velocity and thermal boundary layers for flow over a flat plate with an unheated section. Rebay et al [13] numerically investigated the forced convection over a horizontal microstructure having an unheated section for constant heat flux boundary condition.…”

Section: Introductionmentioning

confidence: 99%

Laminar Forced Convection Over An Inclined Flat Plate With Unheated Starting Length

Turgut¹,

Ozcan²,

Turkoglu³

2018

Journal of Polytechnic

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Turgut O., Ozcan A. C. and Turkoglu H., "Laminar forced convection over an inclined flat plate with unheated starting length", Politeknik Dergisi, 22(1): 53-62, (2019).Erişim linki (To link to this article): http://dergipark.gov.tr/politeknik/archive ABSTRACT Two-dimensional laminar forced convection over an inclined flat plate with an unheated starting length was investigated numerically for both constant surface temperature and constant heat flux boundary conditions. The numerical study was implemented using the commercial software ANSYS Fluent 15.0. Air is used as working fluid. The influence of Reynolds number, inclination angle and the length of unheated plate on velocity and temperature distributions, surface temperature, surface heat flux and local Nusselt number was investigated. The results show that Reynolds number, inclination angle and the length of unheated region of plate play important role on heat transfer from the plate. It is seen that Nusselt number increases with increasing Reynolds number and inclination angle of inclined flat plate but decreases with increasing the length of unheated region of plate. ÖZIsıtılmamış başlangıç uzunluğuna sahip bir eğik düz plaka üzerindeki iki boyutlu laminar zorlanmış konveksiyon sabit yüzey sıcaklığı ve sabit yüzey ısı akısı sınır şartları için sayısal olarak incelenmiştir. Sayısal çalışma ANSYS Fluent 15.0 ticari paket programı kullanılarak gerçekleştirilmiştir. Çalışma akışkanı olarak hava kullanılmıştır. Reynolds sayısının, ısıtılmamış plaka uzunluğunun ve plaka eğim açısının hız ve sıcaklık dağılımları, yüzey sıcaklığı, yüzey ısı akısı ve yerel Nusselt sayısı üzerindeki etkisi incelenmiştir. Sonuçlar Reynolds sayısının, plaka eğim açısının ve düz plakanın ısıtılmamış bölge uzunluğunun plakadan olan ısı transferi için önemli olduğunu göstermiştir. Nusselt sayısının artan Reynolds sayısı ve düz plaka eğim açısı ile arttığı, fakat düz plakanın ısıtılmamış bölge uzunluğunun artması ile azaldığı görülmüştür.Anahtar Kelimeler: Laminar akış, zorlanmış konveksiyon, eğik düz plaka, ısıtılmamış uzunluk, numerik analiz

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Development of flat-plate thermal and velocity boundary layers under highly turbulent and instable air flows: Reynolds numbers ranging from 8400 to 127000

Cited by 9 publications

References 16 publications

A review on surface heat and mass transfer coefficients during air chilling and storage of food products

A review on surface heat and mass transfer coefficients during air chilling and storage of food products

An Integral Energy Equation Model for Heat Convection to Turbulent Boundary Layer on a Flat Plate

Laminar Forced Convection Over An Inclined Flat Plate With Unheated Starting Length

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