twf

A comparison between two ways flow ( TWF) membrane filtration process and common membrane filtration process were made in a PVDF hollow fiber membrane separation process.

利用聚偏氟乙烯（PVDF）中空纤维膜，对比考察了双向流膜过滤工艺与普通膜过滤工艺。

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To carry out the on-line cleaning in industry, a kind of cleaning equipment is devised according to the principle of the Two Way Flow ( TWF) technology, and two cleaning schemes is constituted.

根据双向流技术（TWF）的原理，设计了清洗中试的装置和两种在线清洗方案。

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Thermal weight function ( TWF) method was introduced to calculate thermal stress intensity factors ( SIF) in axisymmetric thermal shock problems.

热权函数法利用温度与热权函数的乘积的积分来直接计算热冲击过程中裂纹尖端的应力强度因子过渡过程。

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Formulae which couple the TWF method with FEM were given based on the stiffness matrix derivative method and Gauss-Chebyshev Quadrature.

本文将热权函数与有限元法直接耦合，给出了基于刚度阵导数法和Gauss-Chebyshev积分的热权函数计算格式。

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TWF is independent of time.

热权函数与时间τ无关。

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At last, the online cleaning was carried out using the Two Way Flow ( TWF) technology.

最后进行了双向流工艺的在线中试研究。

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Since repeated FEM or BEM analyses for every instant are avoided by using the TWF method, the calculation procedure is greatly simplified, and the efficiency is raised to a great deal.

由于免除了对每一时刻τ所需作的有限元或边界元分析，计算过程大大简化，计算效率得到极大提高。

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