principle of mass conservation

based on principle of mass conservation, this paper sets up mathematical model of gas water two phase steady flow.

从渗流力学的基本原理出发，基于质量守恒原理，建立了气水两相地层稳定渗流的数学模型。

By analyzing the principle of conservation of mass, we can get the continuity equation of coal containing gas.

通过质量守恒定律，分析得到含瓦斯煤岩的连续性方程。

By choosing parameters of biomass gas produced by fixed-bed downdraft gasifier, according to the principle of heat transfer and conservation of mass, this paper optimized the design of the biomass gas cleaning device.

选择固定床下吸式气化炉产生的秸秆燃气为参数，根据传热学及质量守衡原理，优化设计出了秸秆燃气净化装置。

The composites were analyzed by thermal chemical ablation mechanism. The principles of conservation of energy, mass conservation principle, the principle of thermal chemical reaction equilibrium are coupled to thermal chemical ablation model.

可以通过对复合材料热化学烧蚀机理进行分析，耦合能量守恒原理、质量守恒原理和热化学反应平衡原理建立复合材料的热化学烧蚀模型。