Measurement of transient fluid temperature

Jaremkiewicz, Magdalena; Taler, Dawid; Sobota, Tomasz

doi:10.1016/j.ijthermalsci.2014.09.002

Cited by 25 publications

(22 citation statements)

References 12 publications

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“…By measuring the pressure element outer surface temperature in a small area, it is possible to determine the temperature of the inner surface. The presented method combined with the method of measuring the fluid unsteady-state temperature described in [12] enables calculation of the heat transfer coefficient on the inner surface. Owing to precise determination of the heat transfer coefficient on the inner surface, thermal stresses arising in the pressure element can be calculated by means of the finite element method.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, extensive research has been conducted on the development of methods based on solving inverse heat conduction problems [5][6][7][8][9][10][11][12][13]. These methods enable determination of the inner surface temperature on the basis of two known boundary conditions on the outer surface.…”

Section: Introductionmentioning

confidence: 99%

“…These methods enable determination of the inner surface temperature on the basis of two known boundary conditions on the outer surface. In the case of elements with regular shapes, the two-or three-dimensional transient temperature field can be determined by solving the inverse heat conduction problem using marching methods [7,8,11,12]. In order to calculate the inner surface transient-state temperature, the inverse region is divided into control volumes.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, a new approach to temperature and thermal stress determination is proposed. Using the heat transfer coefficient determined on the element inner surface and the fluid temperature [12], commercial programs based on the finite element method can be applied to calculate thermal stresses. In this way, thermal stresses on the edges of holes or other places of stress concentration can be found.…”

Section: Introductionmentioning

confidence: 99%

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Determination of transient temperature fields in thick-walled elements using the inverse method

Jaremkiewicz

Cebula

2017

E3S Web Conf.

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Abstract. The purpose of this paper is to propose a method of determining the transient temperature of the inner surface of thick-walled elements. The method can be used to determine thermal stresses in pressure elements. An inverse marching method is proposed to determine the transient temperature of the thickwalled element inner surface with high accuracy. The inverse method was validated computationally. The comparison between the temperatures obtained from the direct heat conduction problem solution and the results obtained by means of the proposed inverse method is very satisfactory. The advantage of the method is the possibility of determining the heat transfer coefficient at a point on the exposed surface based on the local temperature distribution measured on the insulated outer surface. The heat transfer coefficient determined experimentally can be used to calculate thermal stresses in elements with a complex shape. The proposed method can be used in online computer systems to monitor temperature and thermal stresses in thick-walled pressure components because the computing time is very short.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of transient temperature fields in thick-walled elements using the inverse method

Jaremkiewicz

Cebula

2017

E3S Web Conf.

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“…To identify thermal stresses in pressure elements in transient states, the fluid temperature [13][14][15][16] and the heat transfer coefficient at the surface in contact with the fluid must be known. The heat transfer coefficient is determined by the temperature of the high-pressure fluid and the temperature of the surface in contact with the fluid.…”

Section: Introductionmentioning

confidence: 99%

Online Determining Heat Transfer Coefficient for Monitoring Transient Thermal Stresses

Jaremkiewicz

Taler

2020

Energies

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This paper proposes an effective method for determining thermal stresses in structural elements with a three-dimensional transient temperature field. This is the situation in the case of pressure elements of complex shapes. When the thermal stresses are determined by the finite element method (FEM), the temperature of the fluid and the heat transfer coefficient on the internal surface must be known. Both values are very difficult to determine under industrial conditions. In this paper, an inverse space marching method was proposed for the determination of the heat transfer coefficient on the active surface of the thick-walled plate. The temperature and heat flux on the exposed surface were obtained by measuring the unsteady temperature in a small region on the insulated external surface of a pressure component that is easily accessible. Three different procedures for the determination of the heat transfer coefficient on the water-spray surface were presented, with the division of the plate into three or four finite volumes in the normal direction to the plate surface. Calculation and experimental tests were carried out in order to validate the method. The results of the measurements and calculations agreed very well. The computer calculation time is short, so the technique can be used for online stress determination. The proposed method can be applied to monitor thermal stresses in the components of the power unit in thermal power plants, both conventional and nuclear.

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Monitoring of thermal stresses in pressure components based on the wall temperature measurement

Taler

Taler²,

Kaczmarski

et al. 2018

Energy

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Measurement of transient fluid temperature

Cited by 25 publications

References 12 publications

Determination of transient temperature fields in thick-walled elements using the inverse method

Determination of transient temperature fields in thick-walled elements using the inverse method

Online Determining Heat Transfer Coefficient for Monitoring Transient Thermal Stresses

Monitoring of thermal stresses in pressure components based on the wall temperature measurement

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