Thermodynamic optimization of three-thermal irreversible systems

Giannetti, Niccolò; Rocchetti, Andrea; Saito, Kiyoshi

doi:10.18280/ijht.34s110

Cited by 10 publications

(2 citation statements)

References 12 publications

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“…[3][4]. The current literature shows the distinct flow configurations (such as river-delta [3], economy [5], sports [6], lungs [7], heat generating domain with highconductivity inserts [8], thermodynamic optimization [9] and many more) can be explained or designed in consideration with the constructal law.…”

Section: Introductionmentioning

confidence: 99%

The effect of cavities and T-shaped assembly of fins on overall thermal resistances

Çetin¹,

Çetkin²

2017

IJHT

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In this study, authors show that maximum excess temperature on a heat generating cylindrical solid domain can be minimized with numerically optimized rectangular cavities and T-shaped fins. The effect of the cavities and the fins on overall thermal resistances were compared while their volume fraction in a unit volume element is fixed. Furthermore, the designs correspond to the minimum thermal resistance were uncovered for two types of flows; parallel and cross-flow. The governing equations of the heat transfer and the fluid flow were solved simultaneously in order to show the effects of design on the flow characteristics and the thermal performance. Two-dimensional solution domain was used to uncover the thermal performance in cross-flow case because the flow direction is perpendicular to the heat transfer surface area of the heat generating domain. However, three-dimensional domain was used in parallel flow case because the fluid flows along the outer surface of the heat generating domain. For the cross-flow case, the results show that T-shaped assembly of fins with longer stem and shorter tributaries correspond to the lower peak temperature. In addition, the results also show that there is an optimal cavity shape that minimizes the peak temperature. This optimal shape becomes thinner when the number of the cavities increase. In parallel flow case, fins with thicker and shorter stem and longer tributaries correspond to the minimum excess temperature. In addition, the longer and thinner cavities increase the thermal performance in parallel flow case.

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Section: Introductionmentioning

confidence: 99%

The effect of cavities and T-shaped assembly of fins on overall thermal resistances

Çetin¹,

Çetkin²

2017

IJHT

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“…In addition, thermal-mechanical coupling stiffness has a great influence on the dynamic performance [3]. Therefore, research on the vibration of the machine tool is the problem of actual dynamic stiffness and thermal-mechanical coupling stiffness [4] [5]. Figure.1 shows the structure of machine tool's feed system.…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal-mechanical coupling effect on vibration of double-drive feed system

Huang¹,

Yuan²,

Wang³

2017

IJHT

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A double-drive feed system has the characteristics of complex loads and multi-thermal sources, so the dynamic performance of the feed system is a thermal-mechanical coupling problem. In this paper, the mechanism of the thermal-mechanical coupling effect on the vibration of the machine tool feed system is discussed. The effect of the thermal-mechanical coupling effect on the dynamic performance of the feed system was analyzed by experimental data, as well as the influence of the coupling effect on the structural deformation. The above results showed that a rising temperature made the natural frequency of the system decrease and the vibration amplitude of the feed system increase with a maximum rate of increase up to 14.06 ％ . Through experiment and simulation, the dynamic simulation and analysis method of the thermalmechanical coupling of a machine tool feed system are shown to be rational and feasible.

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