含沙掺气高速水流壁面脉动压力特性

在阐述水流脉动压力基本理论的基础上，对含沙掺气高速水流的脉动压力进行了试验．研究了水、气、沙三相流体的压力脉动特性．探讨了掺气、含沙量等参数对水流压力脉动幅值特性、频率特性的影响．

掺气射流水气两相流测试研究

本文通过选择激光测速仪信号处理器ＢＳＡ和Ｃｏｕｎｔｅｒ中的增益、高压和“门限”（ＯｖｅｒｓｉｚｅＲｅｊｅｃｔＬｅｖｅｌ）的取值范围，用调节和控制速度多普勒信号幅值（电压）的方法，对自掺气射流冲击水垫塘后，塘内射流主区及扩散区中气泡及清水的时均速度和脉动速度进行了实测。结果表明，在掺气减速流中，气泡的时均速度普遍小于清水速度，而气泡的脉动速度及紊流度却大于清水相应值。

在常规水洞中模拟气—液两相流的试验

本文介绍利用常规的循环水洞,模拟气——液两相流试验的方法.所获得的初步试验成果证实:在气——液两相介质中最低的声速约为30米/秒左右,并且在超音速气——液两相流中也有产生激波的可能.并讨论了深入开展超音速气——液两相流研究的重要意义.

Pore-scale simulation of gas-water flow in low permeability gas reservoirs

A novel method was developed to establish a realistic three dimensional(3D) network model representing pore space in low permeability sandstone.Digital core of rock sample was established by the combination of micro-CT scanning and image processing,then 3D pore-throat network model was extracted from the digital core through analyzing pore space topology,calculating pore-throat parameters and simplifying the shapes of pores and throats.The good agreements between predicted and measured porosity and absolute permeability verified the validity of this new network model.Gas-water flow mechanism was studied by using pore-scale simulations,and the influence of pore structure parameters,including coordination number,aspect ratio and shape factor,on gas-water flow,was investigated.The present simulation results show that with the increment of coordination number,gas flow ability in network improves and the effect of invading water on blocking gas flow weakens.The smaller the aspect ratio is,the stronger the anisotropy of the network is,resulting in the increase of seepage resistance.It is found that the shape factor mainly affects the end points in relative permeability curves,and for a highly irregular pore or throat with a small shape factor,the irreducible water saturation(Swi) and residual gas saturation(Sgr) are relatively high.

Coupled Seepage and Heat Transfer Intake Model

In the beach well intake system, heat is transferred from soil to fluid when seawater is filtered through the aquifer, providing higher temperature source water to the seawater source heat pump (SWHP) system in winter. A 3-D coupled seepage and heat transfer model for studying beach well intake system is established by adopting the computer code FLUENT. Numerical results of this model are compared with the experimental results under the same conditions. Based on the experiment-verified coupled model, numerical simulation of the supply water tem-perature is studied over a heating season. Results show that the minimum temperature of supply water is 275.2 K when this intake system continuously provides seawater with flow rate of 35 m3/h to SWHP. Results also indicate that the supply water temperature is higher than seawater, and that the minimum temperature of supply water lags behind seawater, ensuring effective and reliable operation of SWHP.

Gas drainage efficiency improvement by increasing coalbed permeability using waterjet cutting system

This paper presented a method to create artificial fractures along the existing gas drainage borehole and increase the permeability of the coalbed using a high pressure waterjet cutting system.The field work conducted in Rujigou Colliery, Shenhua Ningxia Coal Group demonstrate that the coalbed permeability is increased, and accordingly, gas drainage efficiency is improved up to 3 to 6 times over the traditional methods using high pressure waterjet technique.Also, based on the monitoring data, the conceptual model for gas drainage process associated with different mining activities has been proposed, and few major advantages using waterjet assistance method have been identified.

Geo-Archeological Hazard in Ehnasi Site, Bani Souf, Egypt

Archaeological sites are most visible records of our cultural heritage, These sites are often constructed of stone threaten by geomorphological processing, pollution, urbanization, public access, groundwater seepage and geological hazards, such as rock falls. These archaeological sites suffered deterioration and failure of some parts. Environmental hazards are the main agent responsible for the monument degrading knowledge of intensity of environmental hazards together with their aggressiveness characteristics surrounding the monumentally area which is important during all phases restoration process （both previous and to be executed in situ）. The main geo-environmental hazards which affect the monuments under investigation; weathering, air pollution, seismic activity.

Influence of Water Vapor on Silica Membrane： Adsorption Properties and Percolation Effect

The influence of water vapor on silica membrane with pore size of ,-4A has been investigated in terms of adsorption properties and percolation effect at 50 and 90 ℃. Two methods are employed： spectroscopic ellipsometry for water vapor adsorption and gas permeation of binary mixture of helium and H2O The adsorption behaviors on the silica membrane comply with the first-order Langmuir isotherm. The investigation demonstrates that helium flux through the silica membrane decreases dramatically in presence of H20 molecules. The transport of gas molecules through such small pores is believed not to be continuous any more, whereas it is reasonably assumed that the gas molecules hop from one occupied site to another unoccupied one under the potential gradient. When the coverage of H20 molecules on the silica surface increases, the dramatic decrease of helium flux could be related to percolation effect, where the adsorbed H20 molecules on the silica surface block the hopping of helium molecules.