scholarly journals Comparison of Seasonal Flow Rate Change Indices Downstream of Three Types of Dams in Southern Quebec (Canada)

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2555
Author(s):  
Francis Delisle ◽  
Ali Arkamose Assani
Keyword(s):  
Flow Rate ◽  
Rate Change ◽  
Seasonal Flow ◽  
Dam Management ◽  
Coefficients Of Variation ◽  
Flow Rate Change ◽  
Natural Type ◽  
Spring Temperatures ◽  
Management Method ◽  
Natural Rivers

The objective of this study is to use two hydrological indices (coefficients of variation and immoderation) to analyze the impacts of dam management methods on seasonal daily flow rate change downstream of three dams: Manouane (diversion-type management method), Ouareau (natural-type management method) and Matawin (inversion-type management method). The results show that this change is far greater downstream of the Matawin dam (characterized by an inversion-type management method) than downstream of the two other dams. Moreover, downstream of the Matawin dam, this daily flow rate change increases significantly over time, while decreasing downstream of the two other dams and in natural rivers. Lastly, this change is better correlated with climate downstream of the Ouareau dam than downstream of the two other dams. It is positively correlated with winter and spring temperatures as well as summer and fall rain. Contrary commonly accepted hypothesis, this study shows that the impacts of dams generally result in an increase of the seasonal flow rate change in Quebec.

scholarly journals Modelling Bubble Lifetime of Thin Film Surfactants Solution on Fuel Spillage

2021 ◽  
pp. 20-33
Author(s):  
Shitakha Felistus ◽  
Kimathi George ◽  
Songa Caroline
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Rate Change ◽  
Eastern Africa ◽  
Maximum Lifetime ◽  
Catholic University ◽  
Fluid Properties ◽  
Flow Rate Change ◽  
The Stability

Aims / Objectives: To find the lifetime of the bubble by plotting the rate of mass flow rate change against time. Place and Duration of Study: Department of Mathematics and Applied Science, Catholic University of Eastern Africa, Nairobi, Kenya, between February 2020 and March 2021. Methodology: The maximum lifetime of the bubble is assumed to match the time when the mass flow rate change is zero. The study also assumes the velocity of flow rate and other fluid properties at the interface of fuel-surfactant constant other than Re. Re is varied from 0.01 to 100. Results: The graphical plots show that for Re ! 1, and Re " 1, the stability depends on diffusive viscosity and linearized convection, respectively. The simulation suggested that the bubble formed at the fuel-surfactant interface may have Re “ 1 and its lifetime is tb » 0.28. Conclusion: The lifetime of surfactant depends on Re while assuming other interface properties constant. Recommendation: Future studies in the area need to consider the effect of variation in temperature, velocity, and Reynolds number in determining the lifetime of a bubble in the thin foam of the surfactant-fuel interface.

scholarly journals Modified Leakage Rate Calculation Models of Natural Gas Pipelines

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Qingmin Hou ◽  
Daheng Yang ◽  
Xiaoyan Li ◽  
Guanghua Xiao ◽  
Siu Chun Michael Ho
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Leakage Rate ◽  
Rate Change ◽  
Feedback Effect ◽  
Gas Pipelines ◽  
Natural Gas Pipelines ◽  
Pipe Model ◽  
Flow Rate Change ◽  
The Impact

The leakage rate is an essential parameter for the risk assessment and failure analysis of natural gas pipelines. The leakage rate of a natural gas pipeline should be calculated quickly and accurately to minimize consequences. First, in this study, models to estimate the leakage rate of natural gas pipelines are reclassified, and the theoretical range of application for each model is also analysed. Second, the impact of the leakage on the flow rate upstream of the leak point is considered, and the method of successive approximation is used to realize this feedback effect of flow rate change. Then, a modified hole-pipe model is developed to calculate the natural gas leakage rate in this paper. Compared with the leakage rate calculated by the hole-pipe model, the leakage rate calculated by the modified hole-pipe model is smaller and closer to the actual leakage rate due to the consideration of the feedback effect of the flow rate change. Finally, the leakage rate curves of the hole-pipe model and the modified hole-pipe model under different d/D conditions are obtained through simulation. The simulation results show that the modified hole-pipe model is able to calculate the leakage rate of any leak aperture, such as the hole-pipe model, and also at a higher accuracy level than the hole-pipe model.

Primary control reserve of electric power by feedwater flow rate change through an additional economizer – A case study of the thermal power plant “Nikola Tesla B”

Energy ◽  
2018 ◽  
Vol 147 ◽  
pp. 782-798 ◽  
Author(s):  
Vladimir D. Stevanovic ◽  
Milica Ilic ◽  
Zeljko Djurovic ◽  
Tadeusz Wala ◽  
Slawomir Muszynski ◽  
...  
Keyword(s):  
Power Plant ◽  
Electric Power ◽  
Flow Rate ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Rate Change ◽  
Primary Control ◽  
Nikola Tesla ◽  
Flow Rate Change

Study of Fuel Flow Rate Change in Injector for Methanol Fueled S.I. Engine

1995 ◽  
Author(s):  
Masao Kinoshita ◽  
Akinori Saito ◽  
Katsuji Otsubo
Keyword(s):  
Flow Rate ◽  
Rate Change ◽  
Fuel Flow Rate ◽  
Fuel Flow ◽  
Flow Rate Change

scholarly journals The Flow Rate Change Caused by Safety Huber-pointed Needle in Cancer Chemotherapy

2016 ◽  
Vol 42 (8) ◽  
pp. 576-581
Author(s):  
Hideyuki Kushihara ◽  
Tomoe Kushihara ◽  
Mayumi Amano ◽  
Nagisa Hamajima ◽  
Chihiro Kondoh ◽  
...  
Keyword(s):  
Cancer Chemotherapy ◽  
Flow Rate ◽  
Rate Change ◽  
Flow Rate Change

scholarly journals Dynamic Response of Shell and Tube Heat Exchangers to Flow Rate Change

1967 ◽  
Vol 31 (8) ◽  
pp. 812-818,a1 ◽  
Author(s):  
Masao Imaeda ◽  
Shigeru Hayashi ◽  
Sachio Sugiyama
Keyword(s):  
Dynamic Response ◽  
Flow Rate ◽  
Heat Exchangers ◽  
Rate Change ◽  
Flow Rate Change ◽  
Shell And Tube
Sign in / Sign up

Export Citation Format

Share Document