Abstract
The article is devoted to the investigation of aluminium alloy plate-finned tube characteristics regarding to the heat exchange intensification. Outer thick finning, inner ribs quantity and rib shape allow to increase heat exchange efficiency. However, the most important task is finding an optimal combination of pipe geometry parameters. Seven different ribbed tube samples were investigated during the experiment. The samples differed by geometry, quality and quantity of ribbing, and consequently hydraulic and thermodynamic characteristics. The main criteria for an integrated assessment of pressure losses and energy indicators were the criteria of Kirpichev and Antufiev. The above evaluation criteria were intended for an overall assessment of sample effectiveness based on experimental data. In advance and parallel with a natural experiment, a numerical experiment was conducted. The purpose of the numerical experiment was obtaining an adequate model of the heat exchange section to be used in a full-sized oil cooler model in the future. Thus, the article discusses the results of comparing natural and numerical investigations and the prospect of using the best sample in the oil cooler composition. The ultimate goal is the development of an automatic air-cooling apparatus with a compact high-performance oil cooler.
Highlights
Air-cooled heat exchangers are used in different domains, including nuclear, aviation, chemical, oil and gas extracting industries
The article is devoted to the investigation of aluminium alloy plate-finned tube characteristics regarding the heat exchange intensification
The maximum thermal efficiency fixed for sample 5 having 8 mm fin height and 2.5 mm fin pitch in combination with 67.5 mm tube width and 8.3 mm tube height with eight inner channels (Table 4, Figure 6)
Summary
Air-cooled heat exchangers are used in different domains, including nuclear, aviation, chemical, oil and gas extracting industries. The key and characteristic element of any oil cooler is the cooling (or heat exchange) section, which can consist of smooth or finned tubes that intensify heat transfer. This is well known that the heat exchange intensifier usage [1]. This study represents some results of natural and numerical investigations of lamellar-ribbed tube samples. The samples are made of aluminium alloy and they are varieties of monometallic tubes with dissected ribbing (Figure 2). According to study [6], the heat transfer coefficient of a dissected (serrated) finned tube is 20 percent more than smooth finned tube. Low transitional thermal resistance and high thermal conductivity in combination with cheap manufacturing make the aluminum alloy monometallic flat tube usage preferable in comparison with a steel round spiral-finned tube
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