Study on the Shear Stress and Normal Stress of Foams
Foams became an industrial material at the beginning of this century. The Rheological properties of foam have attracted great interest since,the foam fracturing method for enhancement of oil recovery in petroleum production was developed. In the past 20 years, many experimental studies of the rheological properties of foams have been carried out. But the research results often differ because of foams. complex rheological properties. Since the 80s, several theoretical studies of it have become available (1,2,3). However, the two-dimensional spatial periodic structure they used in the theory is so ideal that the theoretical results differ greatly from the experimental results. This paper makes use of a three-dimensional spatially periodic structure to derive the theoretical expression of the shear stress and normal stress of foams, and checks the expression by experimental datas.
KeywordsNormal Stress Rheological Property Interfacial Tension Deformation Model Industrial Material
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