Turbulent heat transfer in a circular tube with circumferentially varying thermal boundary conditions

Gärtner, D.; Johannsen, Klaus; Ramm, H.

doi:10.1016/0017-9310(74)90182-3

Cited by 33 publications

(18 citation statements)

References 14 publications

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“…In principle, κ T is a function of r and θ . However, it has been shown that the effect of the circumferential variation of κ T is small compared to its radial variation [20,18,9]. Hence, in the present paper we assume κ T = κ T (r).…”

Section: Mathematical Formulationmentioning

confidence: 94%

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Heat transfer and thermal stresses in a circular tube with a non-uniform heat flux

Marugán-Cruz

Flores

Santana

et al. 2016

International Journal of Heat and Mass Transfer

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This paper presents a thermal analysis of thin-wall pipes under non-uniform heat flux in the circumferential direction, with a turbulent flow in statistically stationary state inside. The temperature distribution in the solid and in the fluid is obtained using an spectral method that solves the conjugate heat transfer problem. Special attention is paid to the film temperatures and the thermal stresses on the solid, that are compared to predictions based on 1D models in which the the circumferential heat transfer is neglected. The comparison shows that, even if at sufficiently large Biot numbers (Bi 0.2) the 1D model gives a reasonable prediction of the film temperatures (less than 5% of error), the 1D model for the thermal stresses is only appropriate for very large Biot numbers (Bi 10), giving qualitatively wrong results for Biot numbers below 0.3.

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Section: Mathematical Formulationmentioning

confidence: 94%

“…To some extent, the present numerical work can be considered as a continuation of previous works [4,5,18] which only considered the heat transfer in the fluid part. Here we add also the heat transfer problem on the solid part.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and thermal stresses in a circular tube with a non-uniform heat flux

Marugán-Cruz

Flores

Santana

et al. 2016

International Journal of Heat and Mass Transfer

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“…La [Temperature variations along the absorber pipes for fluid (1), metal's front external (2) and internal (3) side, metal's back external (4) side, at t = -1" (A), + 2" (B), + 8" (C) and + 120" (D) after an incident power step at t = 0.] [Isotherms for different sections specified in figure 1 [14][15][16][17]) ou avec le temps (par exemple [18][19] (Fig. 4) …”

Section: Introductionmentioning

confidence: 99%

Etude numérique des convertisseurs héliothermiques tubulaires. Application aux capteurs THEK

Pasquetti¹

1986

Rev. Phys. Appl. (Paris)

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“…The local heat transfer in a circumferential segment is then derived from the heat flux distribution around the inner circumference of the tube according to a method developed by Reynolds [19] and Gärtner, Johannsen, and Ramm [20]. Due to the maximum allowable pressure drop, the flow velocity and flow path length (number of tubes in series) are limited.…”

Section: Internal Forced Convectionmentioning

confidence: 99%

The hybrid pressurized air receiver (HPAR) in the SUNDISC cycle

Heller

Hoffmann

Gauché

2016

AIP Conference Proceedings

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Study and modeling of a pressurized air receiver to power a micro gas turbine AIP Conference Proceedings 1734, 030027 (2016) Abstract. Tubular metallic pressurized air solar receivers face challenges in terms of temperature distribution on the absorber tubes and the limited sustainable solar influx. The HPAR concept aims at mitigating these problems through a macro-volumetric design and a secondary non-pressurized air flow around the absorber elements. Here, a 360• manifestation of this concept for implementation in the dual-pressure SUNDISC cycle is presented. Computationally inexpensive models for the numerous heat flows were developed for use in parametric studies of a receiver's geometric layout. Initial findings are presented on the optical penetration of concentrated solar radiation into the absorber structure, blocking of thermal radiation from hot surfaces and the influence of the flow path through the heated tubes. In the basic design the heat transfer to the non-pressurized air stream is found to be insufficient and possible measures for its improvement are given. Their effect will be examined in more detailed models of external convection and thermal radiation to be able to provide performance estimates of the system.

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Turbulent heat transfer in a circular tube with circumferentially varying thermal boundary conditions

Cited by 33 publications

References 14 publications

Heat transfer and thermal stresses in a circular tube with a non-uniform heat flux

Heat transfer and thermal stresses in a circular tube with a non-uniform heat flux

Etude numérique des convertisseurs héliothermiques tubulaires. Application aux capteurs THEK

The hybrid pressurized air receiver (HPAR) in the SUNDISC cycle

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