By Yehuda Bachmat, Jacob Bear (auth.), Jacob Bear, M. Yavuz Corapcioglu (eds.)

This quantity comprises the lectures offered on the NATO complex learn INSTITUTE that happened at Newark, Delaware, U. S. A. , July 14-23, 1985. the target of this assembly used to be to offer and talk about chosen themes linked to shipping phenomena in porous media. via their very nature, porous media and phenomena of delivery of in depth amounts that happen in them, are very advanced. the cast matrix should be inflexible, or deformable (elastically, or following another constitutive relation), the void house will be occupied through a number of fluid levels. every one fluid part will be composed of multiple part, with a few of the parts able to interacting between themselves and/or with the forged matrix. The delivery technique might be isothermal or non-isothermal, without or with section adjustments. Porous medium domain names during which large amounts, akin to mass of a fluid section, element of a fluid part, or warmth of the porous medium as an entire, are being transported ensue within the perform in a number of disciplines.

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Care must always be taken,as emphasized throughout this chapter, that the physical processes are being properly described and averaged in the scale-up. Although it has been recognized for some time that transport through porous media depends on the microstructure of the pore space, the macroscopic effects cannot, as yet, be interpret ted in terms of simple cause and effect relationships due to the microscopic events. Correlating a change in one variable with a change in another is a long way from demonstrating that one is the cause of the other.

29); or observe diffusion, (24), or surfactant transfer mobilizing residual oil within a pore as is described later, (8), or events over a few pores, such as ganglion backflow (26), or over a few thousand pores to obtain average saturations, (27). 3. PORE LEVEL PHYSICAL MODELS - THE MICROMODEL Micromodels are 2-D flow cells which represent idealized porous media. They have a network of flow channels and are constructed in transparent material to enable the fluids to be directly observed and recorded as displacement and mass transfer occur.

Often one of the fluids is dyed so that it can be distinguished. Dyes can also be used to follow dispersion patterns within a single phase although they are surface active and their effects on wettability must be taken into account when analysing results. 2. Network Design The photomasks used to control the etching procedures can be produced either by hand-drafting or by computer graphics and microfilm facilities, allowing both design flexibility and control over the network parameters. Figure 3 gives a number of examples.

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