high-velocity bed 中文意思是什麼
high-velocity bed
解釋
高速層-
In this paper, high heat penetration into a moving particulate bed is described mathematically with a comprehensive heat and mass transfer model. the distribution of gas velocity and pressure, the temperature field of gas and solid in the moving particulate bed are examined for different conditions. the results show that thermal penetration into the moving packed - bed particles by fluid flow in porous media is high only in the position near the gas entrance. the thermal penetration thickness tends to increase with the fluid flow velocity and decrease with the particle moving velocity. in the region of thermal penetration, the porosity of solid bed has significant effect on gas field and pressure loss. it is feasible to reduce the gas pressure loss by a larger width / height packed bed in design and operation. the correspondence between thermal infection depth and particle bed height would be helpful to keep high oapacity of reactor and reduce the cost of operation
針對移動顆粒床中物料層內的高溫氣體滲流傳熱現象，考慮滲流與傳熱的相互作用，採用局部非熱平衡假設建立了多孔介質滲流傳熱物理數學模型並進行了數值計算.研究了不同情況下床內填充多孔介質中的流速、氣固溫度和床層壓力損失.計算結果表明，高溫熱氣對移動床顆粒料層的熱滲透主要發生在滲流入口端區域，增大入口滲流速度以及減小床層物料下移速度將導致物料溫度沿床高慢速下降，熱滲透深度擴大，熱滲透作用區域內的物料溫度水平提高.在熱滲透作用區域，孔隙率對流場和壓力損失有很大的影響.研究結果對于移動顆粒床反應器的設計與運行具有一定的參考作用 -
Performances of high - velocity double - chamber bed and its application effects
高流速雙室床的技術性能及應用效果 -
Jet grouting is a foundation treatment method that a high - velocity grout, which is forced under high pressure out of a nozzle, cuts into the soil to form a cylindrical soil - cement solidification, and with the result of that the bearing capacity of the foundation is enhanced and the settlement and the differential settlement are reduced. this process is widely used in constructional engineering, highway bridge, coal mine and railway bed
旋噴注漿法可在地層深處將水泥漿液等以高壓旋轉沖切土體，形成水泥土圓柱加固體，構成旋噴樁復合地基，以達到加固地基，提高承載力和減少建築物的沉降和不均勻沉降的目的，在我國建築工程、公路橋梁、煤礦和鐵路路基等建設工程中應用極為廣泛。 -
The catalysts exhibited good adaptability to feedstock at high carbon space velocity, with higher conversion, little pressure drop over the bed, good tolerance to steam hydration, poisoning and coke formation, and good regeneratibility
結果表明，該催化劑對原料的適應性較強，使用空速高，轉化率高，床層阻力降小，抗蒸汽水合氧化能力、抗毒物能力和抗積炭能力較強，催化劑可還原再生，燒炭速率快。
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