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Outline
Taking the filter membrane of a microbial sampler as the research background, a porous step model was used to simulate the structure of the microbial sampling membrane. The internal flow field of the sampler was numerically investigated using the finite element method. Simulations were conducted to analyze the filtration pressure drop, flow velocity variation patterns, and the distribution of velocity and pressure contours within the sampler. The influence of fluid inlet velocity parameters on the performance of the deep-sea microbial sampling device was studied, thereby determining the optimal fluid inlet velocity parameters for the deep-sea microbial sampler. The results show that under the conditions of inlet velocity of 0.1, 0.2, 0.3, 0.4, 0.5, the pressure drops on both sides of the filter membrane of the sampler are 36, 82, 139, 207, 288 Pa, and the differences of flow velocity on both sides of the filter membrane of the sampler are 0.05, 0.16, 0.26, 0.34, 0.38, respectively. The pressure drop across the filter membrane of the sampler and the velocity difference between both sides of the membrane increase with the increase in the inlet velocity, while the pressure behind the filter membrane decreases as the velocity increases. When the fluid inlet velocity is 0.3, the filtration performance of the sampler reaches its optimum. Numerical simulation results can provide a theoretical basis for researching the filtration performance of deep-sea microbial sampling devices.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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