The pressure drop of cylindrical acetate fibers is one of the most important physical indicators affecting the adsorption performance of filter materials. In order to analyze the change law of pressure drop when the gas passes through the cylindrical acetate fiber, the geometric modeling of the cylindrical acetate fiber gas channel was constructed by using the ANSYS software, the geometric modeling of the cylinder filter material was meshed, and the gas flow law was simulated by using the Fluent software. The results showed that the gas flows into the cylindrical acetate fiber in a conical shape, and the changes in gas pressure and temperature are consistent and also show a conical shape. The center velocity is the highest and continuously decreases along the radial direction. At 1.2 seconds, the gas flow rate is the fastest, which is consistent with the change in the velocity UDF equation. A calculation method for obtaining the pressure drop of cylindrical acetate fibers at any position through proportional segmentation method was proposed. This method avoids the use of split filter rods, with an error of less than 5%, which improves the calculation efficiency, making it easy to apply in other filter materials.
Ash line width affects consumers' judgment of cigarette quality. In this paper, the width of ash line is determined and its calculation method is studied, which is tested by full vision testing equipment. The test results show that the width of ash line of cigarettes with the same crack rate is different, which can be used as an index to measure the appearance quality of cigarettes in the process of combustion. The average ash line width of the measured sample is larger for common cigarettes than for medium and slim cigarettes. In the process of moving backward with the combustion section, the carbonization line is affected by factors such as cut tobacco structure, filling density, cigarette paper and leaf group formula. The equipment for measuring cigarette combustion appearance quality with full vision adopts the method of three-side photography in the process of measuring indicators, and the test results of three-side photography of the same cigarette have a large difference rate, which is better than single-side photography.
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