Boiling heat transfer on fins – experimental and numerical procedure

Orzechowski, T.; Tyburczyk, A.

doi:10.1051/epjconf/20146702088

Cited by 7 publications

(9 citation statements)

References 12 publications

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“…In such conditions, it is possible to assume one-dimensional model of heat transfer in the fin [24]. Otherwise, a substantial temperature drop can occur in the mesh layer [25], depending on its thickness h (see Fig.1). The phenomenon is also dependent on the type of contact with the base and the geometry of the arrangement.…”

Section: Experimental Facilitymentioning

confidence: 99%

“…Computations were conducted numerically acc. to the procedure discussed in [25]. For the sake of comparison, superheat distributions are shown for the same distances from the fin base, under the assumption of isotropy, and the effective conductivity of the mesh equal to 10.9 W/mK.…”

Section: Thermal Conductivity Of the Mesh Structure -Physical Modelmentioning

confidence: 99%

“…The construction factors that mostly affect the process include porosity, mesh size and the wire thickness, which was discussed in, e.g. [16], [17] and many other studies.…”

Section: Introductionmentioning

confidence: 99%

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Boiling on fins with wire screen of variable effective conductivity

Orzechowski

2017

EPJ Web Conf.

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Abstract. The high scale of integration of modern equipment used for medical, military and other purposes puts heavy demands as regards the removal of great heat fluxes. This can be achieved only in exchangers that apply the phase change phenomena. Among many methods to improve boiling heat transfer, the wire mesh covering demonstrates some advantages due to the possibilities of designing the desired microstructure parameters, availability on the market, and low cost. The wire mesh microstucture with specified geometrical parameters produces anisotropy in conductivity. The different arrangement of the mesh layers relative to the direction of the heat flux is a cause of the change of temperature distribution within the layer. The consequence is a respective change in the discharge conditions of the gas phase and liquid feed. The experiments were conducted on fins covered with a single layer of copper mesh with lumen of 38 % and boiling FC-72 at ambient pressure. Compared with the smooth surface, the wire mesh structures yield an increase in the heat transfer rate at boiling. It is also shown that nucleate boiling is initiated at lower wall superheat. Formulas for longitudinal and perpendicular thermal conductivity are given for different mesh structure arrangements.

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Section: Experimental Facilitymentioning

confidence: 99%

Section: Thermal Conductivity Of the Mesh Structure -Physical Modelmentioning

confidence: 99%

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Boiling on fins with wire screen of variable effective conductivity

Orzechowski

2017

EPJ Web Conf.

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“…Additionally, it can be used to optimize the operation of the evaporator in an automotive AC system, which is achieved by microscale surface enhancement in systems where the principle of operation involves the phase change of the refrigerant [18,19] in different boiling regimes: from nucleate to film boiling [20,21,22]. The model, which is based on a system of three differential equations, can be employed to optimize the control of the automotive HVAC system, and accordingly, to improve the fuel economy or increase the range [23].…”

Section: Energy Balancementioning

confidence: 99%

Evaluation of thermal conditions inside a vehicle cabin

Orzechowski

Skrobacki

2016

EPJ Web of Conferences

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Abstract. There are several important factors influencing road accidents. Temperature inside the vehicle is ranked third after alcohol and seat belts. For this reason, maintaining thermal comfort in the passenger compartment is essential. Thermal comfort is provided by the air conditioning system, which consumes much energy. In the case of electrically powered vehicles, this results in a shorter range. Optimization of such systems is therefore required. This paper proposes a set of equations describing the thermal conditions inside the vehicle, which are the result of appropriate energy balances for air, interior elements, and glass. Variable transmission conditions are included for transparent materials exposed to short and long wave radiation. The study focused on unsteady air-conditioning of the vehicle interior. The measurement data was compared with the results obtained through numerical solutions of the proposed set of equations.

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“…The use of microstructured surfaces produced in thermal processes (as described in [12][13][14][15]) is known to intensify the heat transfer process. Studies have been conducted on pool boiling [16][17][18][19][20], flow boiling [9][10][11][21][22][23] heat transfer and confined spaces as face seals [24][25].…”

Section: Introductionmentioning

confidence: 99%

Boiling heat transfer during flow of distilled water in an asymmetrically heated rectangular minichannel

Strąk

Piasecka

2017

EPJ Web Conf.

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Abstract. This paper discusses test results concerning flow boiling heat transfer in a minichannel 1.7 mm in depth, 16 mm in width and 180 mm in length. The essential part of the experimental stand was a vertically oriented rectangular minichannel, which was heated asymmetrically with a plate made of Haynes-230 alloy. Distilled water was used as the cooling fluid. Changes in the temperature on the outer side of the heated plate in the central, axially symmetric part of the channel were measured using infrared thermography. Simultaneously, the other side of the heated plate in contact with the fluid was observed through a glass pane to identify the two-phase flow patterns. The one-dimensional model used for the heat transfer analysis took into account the heat flow direction, which was perpendicular to the direction of the fluid flow in the minichannel. The study involved determining local values of the heat transfer coefficient and generating boiling curves. The data for water were compared with the findings reported for the FC-72 fluid.

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Boiling heat transfer on fins – experimental and numerical procedure

Cited by 7 publications

References 12 publications

Boiling on fins with wire screen of variable effective conductivity

Boiling on fins with wire screen of variable effective conductivity

Evaluation of thermal conditions inside a vehicle cabin

Boiling heat transfer during flow of distilled water in an asymmetrically heated rectangular minichannel

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