Wall curvature is a widely used technique to passively enhance convective heat transfer in the thermal processing of highly viscous fluids. These geometries produce highly uneven convective heat flux distribution along the circumferential coordinate, impacting on the performance of the fluid thermal treatment. Although many authors have investigated the forced convective heat transfer in coiled tubes, most of them have presented the results only in terms of the Nusselt number averaged along the wall circumference. Moreover, regarding laminar regime, few data about the local heat transfer coefficient are available. In this paper a procedure to estimate the local convective heat flux in coiled tubes is presented and tested: the temperature distribution maps on the external coil wall are employed as input data for the inverse heat conduction problem in the wall under a solution approach based on Tikhonov regularization method. The investigation was particularly focused on the laminar regime.

ESTIMATION OF LOCAL HEAT TRANSFER COEFFICIENT IN COILED TUBES UNDER INVERSE HEAT CONDUCTION PROBLEM APPROACH / Bozzoli, Fabio; Cattani, Luca; Rainieri, Sara; Pagliarini, Giorgio. - (2013), pp. 1-6. (Intervento presentato al convegno 8th World Conference onExperimental Heat Transfer,Fluid Mechanics and Thermodynamics tenutosi a Lisbona nel 16-20 June 2013).

ESTIMATION OF LOCAL HEAT TRANSFER COEFFICIENT IN COILED TUBES UNDER INVERSE HEAT CONDUCTION PROBLEM APPROACH

BOZZOLI, Fabio;CATTANI, Luca;RAINIERI, Sara;PAGLIARINI, Giorgio
2013-01-01

Abstract

Wall curvature is a widely used technique to passively enhance convective heat transfer in the thermal processing of highly viscous fluids. These geometries produce highly uneven convective heat flux distribution along the circumferential coordinate, impacting on the performance of the fluid thermal treatment. Although many authors have investigated the forced convective heat transfer in coiled tubes, most of them have presented the results only in terms of the Nusselt number averaged along the wall circumference. Moreover, regarding laminar regime, few data about the local heat transfer coefficient are available. In this paper a procedure to estimate the local convective heat flux in coiled tubes is presented and tested: the temperature distribution maps on the external coil wall are employed as input data for the inverse heat conduction problem in the wall under a solution approach based on Tikhonov regularization method. The investigation was particularly focused on the laminar regime.
2013
972-8620-23-3
ESTIMATION OF LOCAL HEAT TRANSFER COEFFICIENT IN COILED TUBES UNDER INVERSE HEAT CONDUCTION PROBLEM APPROACH / Bozzoli, Fabio; Cattani, Luca; Rainieri, Sara; Pagliarini, Giorgio. - (2013), pp. 1-6. (Intervento presentato al convegno 8th World Conference onExperimental Heat Transfer,Fluid Mechanics and Thermodynamics tenutosi a Lisbona nel 16-20 June 2013).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2637267
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