The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions.

Hector Iacovides; K Hanjalic; T Miyauchi; D Borello; M Hadzidic; P Ventirini

The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions.

Hector Iacovides, K Hanjalic (Editor), T Miyauchi (Editor), D Borello (Editor), M Hadzidic (Editor), P Ventirini (Editor)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

This abstract summarizes a mainly experimental investigation of heat transfer across an insulation pack specimen used to protect the Hot Box Dome of an advanced gas cooled nuclear reactor, under actual operating conditions. The pack consists of multiple stainless steel layers forming narrow channels, less than 1 mm wide between them. The facility developed, can operate at pressures of 40 bar and temperature differences of 500 oC, at horizontal and inclined orientations. Measurements led to the calculation of the effective thermal conductivity and also the mapping of the temperature variation across the pack for a range of flow rates, and also for angles to the horizontal of up to 30o. The most striking finding is the strong influence of buoyancy for all flow rates investigated, even for the horizontal cases. Tests at inclined orientations suggest the presence of flow reversal. Two-dimensional conjugate heat transfer numerical analysis also confirms this.

Original language	English
Title of host publication	Turbulence Heat and Mass Transfer 8
Editors	K Hanjalic, T Miyauchi, D Borello, M Hadzidic, P Ventirini
Place of Publication	New York
Publisher	Begell House Publishers Inc.
Pages	201-204
Number of pages	4
Publication status	Published - Sept 2015
Event	8th International Symposium on Turbulence, Heat and Mass Transfer - Sarajevo, Bosnia and Herzegovina Duration: 15 Sept 2015 → 18 Sept 2015

Conference

Conference	8th International Symposium on Turbulence, Heat and Mass Transfer
City	Sarajevo, Bosnia and Herzegovina
Period	15/09/15 → 18/09/15

Keywords

Microchannels
Mixed and Natural Convection
Heat Transfer
High-Pressure and High-Temperature Experiments

Cite this

Iacovides, H., Hanjalic, K. (Ed.), Miyauchi, T. (Ed.), Borello, D. (Ed.), Hadzidic, M. (Ed.), & Ventirini, P. (Ed.) (2015). The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions. In K. Hanjalic, T. Miyauchi, D. Borello, M. Hadzidic, & P. Ventirini (Eds.), Turbulence Heat and Mass Transfer 8 (pp. 201-204). Begell House Publishers Inc..

Iacovides, Hector ; Hanjalic, K (Editor) ; Miyauchi, T (Editor) et al. / The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions. Turbulence Heat and Mass Transfer 8. editor / K Hanjalic ; T Miyauchi ; D Borello ; M Hadzidic ; P Ventirini. New York : Begell House Publishers Inc., 2015. pp. 201-204

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title = "The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions.",

abstract = "This abstract summarizes a mainly experimental investigation of heat transfer across an insulation pack specimen used to protect the Hot Box Dome of an advanced gas cooled nuclear reactor, under actual operating conditions. The pack consists of multiple stainless steel layers forming narrow channels, less than 1 mm wide between them. The facility developed, can operate at pressures of 40 bar and temperature differences of 500 oC, at horizontal and inclined orientations. Measurements led to the calculation of the effective thermal conductivity and also the mapping of the temperature variation across the pack for a range of flow rates, and also for angles to the horizontal of up to 30o. The most striking finding is the strong influence of buoyancy for all flow rates investigated, even for the horizontal cases. Tests at inclined orientations suggest the presence of flow reversal. Two-dimensional conjugate heat transfer numerical analysis also confirms this.",

keywords = "Microchannels, Mixed and Natural Convection, Heat Transfer, High-Pressure and High-Temperature Experiments",

author = "Hector Iacovides and K Hanjalic and T Miyauchi and D Borello and M Hadzidic and P Ventirini",

year = "2015",

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booktitle = "Turbulence Heat and Mass Transfer 8",

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note = "8th International Symposium on Turbulence, Heat and Mass Transfer ; Conference date: 15-09-2015 Through 18-09-2015",

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Iacovides, H, Hanjalic, K (ed.), Miyauchi, T (ed.), Borello, D (ed.), Hadzidic, M (ed.) & Ventirini, P (ed.) 2015, The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions. in K Hanjalic, T Miyauchi, D Borello, M Hadzidic & P Ventirini (eds), Turbulence Heat and Mass Transfer 8. Begell House Publishers Inc., New York, pp. 201-204, 8th International Symposium on Turbulence, Heat and Mass Transfer, Sarajevo, Bosnia and Herzegovina, 15/09/15.

The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions. / Iacovides, Hector; Hanjalic, K (Editor); Miyauchi, T (Editor) et al.
Turbulence Heat and Mass Transfer 8. ed. / K Hanjalic; T Miyauchi; D Borello; M Hadzidic; P Ventirini. New York: Begell House Publishers Inc., 2015. p. 201-204.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions.

AU - Iacovides, Hector

A2 - Hanjalic, K

A2 - Miyauchi, T

A2 - Borello, D

A2 - Hadzidic, M

A2 - Ventirini, P

A2 - Hanjalic, K

A2 - Miyauchi, T

A2 - Borello, D

A2 - Hadzidic, M

A2 - Ventirini, P

PY - 2015/9

Y1 - 2015/9

N2 - This abstract summarizes a mainly experimental investigation of heat transfer across an insulation pack specimen used to protect the Hot Box Dome of an advanced gas cooled nuclear reactor, under actual operating conditions. The pack consists of multiple stainless steel layers forming narrow channels, less than 1 mm wide between them. The facility developed, can operate at pressures of 40 bar and temperature differences of 500 oC, at horizontal and inclined orientations. Measurements led to the calculation of the effective thermal conductivity and also the mapping of the temperature variation across the pack for a range of flow rates, and also for angles to the horizontal of up to 30o. The most striking finding is the strong influence of buoyancy for all flow rates investigated, even for the horizontal cases. Tests at inclined orientations suggest the presence of flow reversal. Two-dimensional conjugate heat transfer numerical analysis also confirms this.

AB - This abstract summarizes a mainly experimental investigation of heat transfer across an insulation pack specimen used to protect the Hot Box Dome of an advanced gas cooled nuclear reactor, under actual operating conditions. The pack consists of multiple stainless steel layers forming narrow channels, less than 1 mm wide between them. The facility developed, can operate at pressures of 40 bar and temperature differences of 500 oC, at horizontal and inclined orientations. Measurements led to the calculation of the effective thermal conductivity and also the mapping of the temperature variation across the pack for a range of flow rates, and also for angles to the horizontal of up to 30o. The most striking finding is the strong influence of buoyancy for all flow rates investigated, even for the horizontal cases. Tests at inclined orientations suggest the presence of flow reversal. Two-dimensional conjugate heat transfer numerical analysis also confirms this.

KW - Microchannels

KW - Mixed and Natural Convection

KW - Heat Transfer

KW - High-Pressure and High-Temperature Experiments

M3 - Conference contribution

SP - 201

EP - 204

BT - Turbulence Heat and Mass Transfer 8

PB - Begell House Publishers Inc.

CY - New York

T2 - 8th International Symposium on Turbulence, Heat and Mass Transfer

Y2 - 15 September 2015 through 18 September 2015

ER -

Iacovides H, Hanjalic K, (ed.), Miyauchi T, (ed.), Borello D, (ed.), Hadzidic M, (ed.), Ventirini P, (ed.). The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions. In Hanjalic K, Miyauchi T, Borello D, Hadzidic M, Ventirini P, editors, Turbulence Heat and Mass Transfer 8. New York: Begell House Publishers Inc. 2015. p. 201-204

The effects of natural and mixed convection on heat transfer across adjacent micro-channels, in extreme pressure and temperature conditions.

Abstract

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