This work presents a numerical investigation on steady internal, external and surface flows of a liquid sphere immersed in a simple shear flow at low and intermediate Reynolds numbers. The control volume formulation i...
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This work presents a numerical investigation on steady internal, external and surface flows of a liquid sphere immersed in a simple shear flow at low and intermediate Reynolds numbers. The control volume formulation is adopted to solve the governing equations of two-phase flow in a 3-D spherical coordinate system. Numerical results show that the streamlines for Re = 0 are closed Jeffery orbits on the surface of the liquid sphere, and also closed curves outside and inside the liquid sphere. However, the streamlines have intricate and non-closed structures for Re ≠ 0. The flow structure is dependent on the values of Reynolds number and interior-to-exterior viscosity ratio.
针对某炼油厂241.5 kt/a饱和干气,采用浅冷油吸收工艺回收其中的碳二及碳二以上馏分,用VMGSim流程模拟软件对浅冷油吸收工艺进行模拟,并对凝液直接送至碳四吸收塔(方案一)和凝液送至凝液汽提塔(方案二)两种方案进行比较.模拟结果表明,两种方案的产品产量及组成存在差别,方案一比方案二多产富乙烷气1.33 t/h,但轻烃产量减少1.38 t/h,方案一富乙烷气中乙烷的含量及轻烃中丙烷的含量均低于方案二;两种方案回收的富乙烷气和轻烃作为乙烯装置裂解原料产出的乙烯、丙烯等产品的产量基本相同;方案二中碳四吸收塔和碳四解吸塔的塔釜温度比方案一低3—4℃,但综合能耗(每吨原料的能耗合标准油)比方案一高2.4 kg.
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