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On an approach to the thermo-elasto-plastic failure based on the Burzynski criterion

Banaś K., Badur J.

Transactions of the Institute of Fluid-Flow Machinery

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2017

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nr 136

65--76

EN

In this paper the comparison of material eort models: the classic Huber-Mises-Hencky approach and the Burzynski condition was presented. Burzynski yield condition is pressure sensitive and naturally takes into account the strength dierential eect, which has been observed in nickel-base super alloys such as Inconel 718. Investigation was performed during thermal-uidstructure interaction analysis of a power turbine guide vane of turbine helicopter engine PZL- 10W. Firstly, computational uid dynamics conjugate heat transfer analysis was carried out, then stress analysis was performed with boundary conditions obtained via computational uid dynamics analysis. During stress analysis, two mentioned above equivalent stress denitions were applied and dierence in material eort modelling by them was shown.

2

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Puvaneswari P., Shailendhra K.

Archive of Mechanical Engineering

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2017

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Vol. LXIV, nr 3

375--399

EN

The combined effect of conjugation, external magnetic field and oscillation on the enhancement of heat transfer in the laminar flow of liquid metals between parallel plate channels is analyzed. In order to make our results useful to the design engineers, we have considered here only the wall materials that are widely employed in liquid metal heat exchangers. Indeed, all the results obtained through this mathematical investigation are in excellent agreement with the available experimental results. The effective thermal diffusivity κe is increased by 3 · 106 times due to oscillation and that the heat flux as high as 1.5 · 1010 (W/m2) can be achieved. Based on our investigation, we have recommended the best choice of liquid metal heat carrier, wall material and its optimum thickness along with the optimum value of the frequency to maximize the heat transfer rate. At the optimum frequency, by choosing a wall of high thermal conductivity and optimum thickness, an increase of 19.98% in κe can be achieved. Our results are directly relevant to the design of a heat transfer device known as electromagnetic dream pipe which is a very recent development.

3

Conjugate heat transfer analysis of the tip seal in the counter rotating low pressure turbine

Bochon K., Wróblewski W.

Archives of Mechanics

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2015

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Vol. 67, nr 3

253--270

EN

The aim of this study was to examine the phenomena associated with leakage flow through the tip seal with honeycomb land and to perform conjugate heat transfer (CHT) analysis of the entire tip area of the blade including the part of casing with rotating cavity above the seal. CFD analyses were performed using commercial software. For the complicated geometrical configuration of the seal region, a calculation model was proposed which enabled a satisfactory approach to flow and heat transfer phenomena. CHT analyses were performed for two cases characterized by different thermal conductivity of the metal. Fluid flow parameters which allowed to recognize flow structures, losses and mixing were taken into account. In CHT analyses, the flow structures for the cavity, the heat transfer conditions as well as the temperature distribution in the whole domain were obtained.

4

Thermal and fluid flow fields in a regenerator with ceramic chimney block checker work

Zashkowa L., Penkova N.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2005

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Vol. 9, No 1

143-151

EN

Selected results of mathematical modelling and computer simulation of transient conjugate heat transfer in a vertical contraflow glass furnace regenerator are reported. The problem is solved three-dimensionally (3D) using the ANSYS 8.0/FLOTRAN program. The main regenerator fluid flow and thermal fields about a cyclic equilibrium of the regenerator are visualized. Heat and fluid flow parameters for the regenerator's cyclic equilibrium are presented by Tm=Tm(H',t); Tm,f=Tm,f(H',t); hm=hm(H',t); V=V(H',t); k=k(H',t) and ε=ε(H',t) graphics. Remarks about transient heat transfer in this kind of regenerators are made based on the obtained numerical values and relationships.

5

Modelling and simulation of fluid flow and heat processes in a regenerator with ceramic chimney block checker work

Zashkowa L., Penkova N.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2005

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Vol. 9, No 1

133-142

EN

Selected results of mathematical modelling and computer simulation of fluid flow and heat transfer processes in a glass furnace regenerator are reported. The conjugate heat transfer problem is solved in 3D using the ANSYS 8.0/FLOTRAN programme. The regenerator's geometry, finite element mesh, thermal loads and boundary conditions are presented. The momentum, continuity and energy equations are solved.

6

Determination of the local overall heat transfer coefficient on plastic tube walls

Rup K.

Archives of Thermodynamics

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2003

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Vol. 24, no 4

67-85

EN

The paper describes determination, by means of theoretical and experimental methods of local overall heat transfer coefficients on a cylindrical partition. Such partition consists of the tube wall made of plastic or alloy steel. In the experiments, the flow of cooled liquid (denatured alcohol) was characterized by Reynolds numbers from the range 3000 < Re < 20000. Water or air was flowing in countercurrent manner on the external tube surface. A mathematical model of momentum and heat exchange processes in the inlet zone of the tube was been elaborated, which considers the thermal boundary condition on the external surface of the tube taken from experiments. To compare the achieved findings, the corresponding experimental results published in the literature are cited. Such comparison shows a good compatibility.