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Yang J.,Xian University of Technology | Feng M.,Xian University of Technology | Bai J.,Xian University of Technology | Bai J.,Shanxi Water Conservancy Technical College | Zhang L.,Xian University of Technology
2011 International Conference on Computer and Management, CAMAN 2011 | Year: 2011

In the paper, some relative research theory and calculation methods for the river ecological basic flow both at home and abroad have been summed up, and then, considering the actual conditions of Sushui River, the function of the river reach is determined. The ecological basic flow of the river in different periods has been quantitatively researched with Tennant and the minimum monthly average flow methods. Further more, the degree of ecological water shortage was analyzed, and for the three representative years (P=50%, P=75%, P=95%) the water shortage for the ecological basic flow in turn is 0.722×10 6∼0.729×106m3, 0.135×10 6∼0.279×106m3 and 0.335×10 6∼0.407×106m3. It is expected to provide a scientific basis for the reasonable allocation of water resources in Sushui River. ©2011 IEEE. Source


Li X.,Taiyuan University of Technology | Li X.,Shanxi Water Conservancy Technical College | Fan G.,Taiyuan University of Technology
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2010

On the basis of the non-sufficient and sufficient water supplied infiltration test of homogenous soil, the infiltration processes for both non-sufficient and sufficient water supplies were analyzed; the correlations of Kostiakov three model parameters for the non-sufficient and sufficient water supplies were established. The result shows that the ponding infiltration process with non-sufficient water supply accords with asymptotic curve of infiltration process with sufficient water supply; the infiltration parameter ratio m increases as the three elements of water supply, namely, intensity, clay content of soil grain and soil bulk density augment, while the parameter ratio m decreases as the two elements of sand content, and moisture content, the steady infiltration rate of non-sufficient water supply equals to steady infiltration rate of sufficient water supply; the infiltration coefficient K1 of non-sufficient water supply equals to the value of the difference between water supplied intensity of water supply and steady infiltration rate. Source


Zhang X.-B.,Xian University of Technology | Zhang X.-B.,Shanxi Water Conservancy Technical College | Zhang L.,Xian University of Technology | Feng M.-Q.,Xian University of Technology | Tang H.,City University of New York
2011 International Conference on Computer and Management, CAMAN 2011 | Year: 2011

Wall slip behavior of sludge was studied experimentally by using a rotational rhehometer with parallel plate fixtures and checking the possible influence factors on sludge wall slip based on the gap dependence of the stress/strain data. In the steady shearing flow it was found that there seems to be no critical shear stress for the onset of slip of sludge, while concentration is the important influence factor to sludge wall slip. In the oscillatory shear flow experiments, we analyze the total wave. While strain γ0 = 0.68, stress amplitude decreases with the time, while strain γ0 = 0.1, the stress amplitude remains constant. The stress sweep under the three gaps was done on the sludge of different angular frequency and temperature. In the previous stage, shear stress coincides better under the different angular frequency in the linear region and nonlinear region, somewhere in the nonlinear area it appears bifurcation, but the shear stress and strain are not constant in the bifurcation point. In a certain temperature range, gap dependence occurs, but the bifurcation point is almost same. It indicates that the wall slip relates to strain, angular frequency and other factor, the temperature of its impact is negligible. ©2011 IEEE. Source


Zhang X.-B.,Xian University of Technology | Zhang X.-B.,Shanxi Water Conservancy Technical College | Feng M.-Q.,Xian University of Technology | Sun X.-H.,Shanxi Water Conservancy Technical College | And 2 more authors.
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2014

The rheological properties of city dewatered sludge are the basic parameters of its pipeline process design, in this paper, by using a parallel plate rotary rheometer (AR2000) to study rheological properties of the sludge, varying the temperature and water content and using the Carreau-Bird model to fit and process the flow data of sludge. We have found that, at different moisture contents with the increase of shear rate, the sludge rheology transforms from the yield pseudoplastic fluid to Bingham fluid, the viscosity of sludge becomes smaller then exhibiting the phenomenon of shear thinning. The apparent viscosity is closely related to the transport of sludge and due to its low apparent viscosity, when moisture content is 72.67%-87.4%, the sludge is suitable for pumping; using Carreau-Bird model to fit sludge rheology curve is relatively good, zero-shear viscosity changes very large with temperature variation, and infinite shear viscosity changes slightly as moisture varies. The time constant appears the maximum when moisture content is near 67.41%, and it increases with the decrease of water content when moisture content is in the range of 81.3% to 87.4%, but it turns smaller with the decrease of water content when its moisture content is in the range of 63.65% to 67.41%. Source


Zhang X.-B.,Xian University of Technology | Zhang X.-B.,Shanxi Water Conservancy Technical College | Feng M.-Q.,Xian University of Technology | Sun X.-H.,Shanxi Water Conservancy Technical College | And 2 more authors.
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2013

In order to study the influencing factors of the city dewatered sludge when wall slip happens, this paper takes experimental analysis on sludge (water content 81.3%) wall slip phenomena using the parallel plate rotational rheometer (AR2000) at room temperature and by means of high speed camera. The results are found, when sludge is dynamically sheared, slid phenomenon happens in a certain period of time. And the shear rate sweep curve with the rate increasing shows some viscoelastic. At the same time, scanning strain in three cases that the corner frequencies are low frequency 0.5 rad/s, medium frequency 6.28 rad/s and high frequency 12.56 rad/s, the various effects of wall slip on force including the total shear stress, elastic stress, viscous stress are analyzed, it is decomposed according to the stress proposed by Cho et al.[13]. It is found that there is a dimensionless parameter τ′/|G*|, the ratio of elastic stress and the complex modulus in linear region between 0.21-0.27, and this parameter decreases slowly with increasing the corner frequency, which showed that time has some effect on sludge wall slip and the elastic stress plays the main role. Source

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