检索结果-南通市图书馆

Upgradation of Heavy Crude Oil Via hydrodynamic cavitation Through Variations in Asphaltenes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2022年第2期24卷 23-33页

作者： Li Kang Han Haibo Lei Jie Wang Youhe Li Dekun Mark J.Rood Fazle Subhan Yan Zifeng State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580China Luoyang R&D Center of Technology of Sinopec Engineering(Group)Co.Ltd. Luoyang 471003China Shandong Oil Refining Association Jinan 250013China Department of Civil and Environmental Engineering University of IllinoisIL 61801USA Department of Chemistry Abdul Wali Khan University MardanMardanKPPakistan

In this work,Saudi heavy crude oil(SHCO)was upgraded by the hydrodynamic cavitation *** collapse of cavitation bubbles instantly produces extreme conditions such as high temperature,pressure,and jet flow and strong shear forces,which can play a significant role in the upgradation *** results revealed that the viscosity and Conradson carbon residue of SHCO decreased from 13.61 to 7.22 mm^(2)/s and from 7.16%to 6.48%,*** boiling point distillation findings showed that the vacuum residue(VR)decreased by 1%.Atmospheric-pressure photoionization Fourier-transform ion cyclotron resonance mass spectrometry,X-ray diffraction,dynamic light scattering,Fourier-transform infrared spectroscopy,and scanning electron microscopy were employed to characterize the molecular composition,crystalline structure,asphaltene aggregate particle size distribution,functional groups,and morphology,respectively,to understand the effects of hydrodynamic cavitation on *** obtained results demonstrate that hydrodynamic cavitation upgradation reduced the interaction forces between the asphaltene molecules,weakening the crystalline structure of the asphaltene aggregates,reducing the degree of association of the aromatic compounds in SHCO and asphaltenes,and decreasing the average particle *** delayed coking properties of the VR were further investigated,and the cavitation treatment was found to decrease the coke yield by 1.85%and increase the liquid and gas yields by 1.52%and 0.33%,***,hydrodynamic cavitation can effectively enhance the processing performance of crude oil by improving the properties and structural characteristics of asphaltenes.

关键词： hydrodynamic cavitation heavy oil upgradation asphaltene crystalline structure particle size distribution agglomeration force

Recent Developments in hydrodynamic cavitation Reactors:cavitation Mechanism,Reactor Design,and Applications

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Engineering 2022年第12期19卷 180-198页

作者： Haoxuan Zheng Ying Zheng Jesse Zhu Department of Chemical and Biochemical Engineering University of Western OntarioLondonON N6A 3K7Canada

hydrodynamic cavitation is considered to be a promising technology for process intensification,due to its high energy efficiency,cost-effective operation,ability to induce chemical reactions,and scale-up *** the past decade,advancements have been made in the fundamental understanding of hydrodynamic cavitation and its main variables,which provide a basis for applications of hydrodynamic cavitation in radical-induced chemical reaction ***,we provide an extensive review of these research efforts,including the fundamentals of hydrodynamic cavitation,the design of cavitation reactors,cavitation-induced reaction enhancement,and relevant industrial *** types of hydrodynamic cavitation reactors—namely,stationary and rotational—are *** design parameters of a hydrodynamic cavitation reactor and reactor performance at the laboratory and pilot scales are discussed,and recommendations are made regarding optimal operation and geometric *** commercial cavitation reactors that are currently on the market are reviewed here for the first *** unique features of hydrodynamic cavitation have been widely applied to various chemical reactions,such as oxidization reactions and wastewater treatment,and to physical processes,such as emulsion generation and component *** roles of radicals and gas bubble implosion are also thoroughly discussed.

关键词： hydrodynamic cavitation cavitation nuclei Hydroxyl radicals Stationary/rotational hydrodynamic cavitation reactor Reaction enhancement cavitation application

Pressure characteristics of hydrodynamic cavitation reactor due to the combination of Venturi tubes with multi-orifice plates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of hydrodynamics 2018年第3期30卷 514-521页

作者：张凯董志勇姚锐豪 Research Institute of Hydraulic and Municipal Engineering Zhejiang University of Technology

The pressure characteristics in the throats of Venturi tube and behind triangular multi-orifice plates were experimentally investigated by a pressure data acquisition system of SINOCERA-YE6263, and the effect of throat length of Venturi tube, different geometric parameters of multi-orifice plate and their combinations on the time-averaged pressure, cavitation number, and pressure frequency spectrum, correlation function calculated by FFT were analyzed. The experimental results showed that the throat length of L/R= 40 made for improving the fluctuation energy and promoting the uniform energy distribution, appropriately decreasing the size and increasing the number of orifice could accelerate the uniform distribution of the fluctuation energy in frequency domain. In the combination reactors, the cavitation number behind multi-orifice plates was lower and the fluctuation of correlation function was more intense.

关键词： hydrodynamic cavitation Venturi tube triangular multi-orifice plate pressure characteristics frequency spectrum correlation function

Intensification of the degradation of Acid RED-18 using hydrodynamic cavitation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Emerging Contaminants 2020年第1期6卷 20-32页

作者： Prashant B.Dhanke Sameer M.Wagh Chemical Engineering Department Padmabhooshan Vasanraodada Patil Institute of Technology BudhgaonSangliMH416304India Chemical Technology Department Laxminarayan Institute of TechnologyNagpurMH440033India

In this work degradation of Acid Red-18(AR-18)was examined in the hydrodynamic cavitation *** plates with different holes geometry are used to determine the optimum plate to carry out the degradation based on cavitation *** obtained optimum orifice plate is used as a cavitating device on varying parameters like initial AR-18 concentrations,pH,temperatures,and operating pressures of the reactor.A photocatalyst(TiO2)was prepared by the sol-gel method and used in combination with H2O2 to intensify the degradation of *** obtained optimum condition of hydrodynamic cavitation was again used in the ultrasonic cavitation reactor for the *** cavitation(orifice)given the highest degradation as compared to hydrodynamic cavitation(Venturi)and Ultrasonic cavitation with and without the use of *** TiO2(300 mg/L)dose,88.1%,70.4%and 64.8%degradation is obtained in HC-O,HC-V and UC reactor at initial AR-18 concentration(15 ppm),pH(3),Operating temperature(35C),and H2O2(300 mg/L).Hence the use of an advanced oxidation process can be successfully used with hydrodynamic cavitation to intensify the degradation of Acid Red-18 under the controlled operating parameters.

关键词： Acid Red-18 hydrodynamic cavitation Hydrogen peroxide Photocatalyst Advance oxidation

An experimental investigation of transient cavitation control on a hydrofoil using hemispherical vortex generators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of hydrodynamics 2021年第6期33卷 1139-1147页

作者： Ebrahim Kadivar Takaho Ochiai Yuka Iga Ould el Moctar Ship Technology Ocean Engineering and Transport SystemsUniversity of Duisburg-EssenDuisburgGermany Institute of Fluid Scienece Tohoku UniversitySendaiJapan

Unsteady cavitation causes noise,damage,and performance decline in the marine engineering and fluid machinery ***,finding a method to control the cavitation and its destructive effects is important for the industrial *** this work,we proposed a passive method to control the unsteady behavior of transient cavitation at the medium Reynolds *** this aim,we performed an experimental study using a high-speed camera to analyze the effects of hemispherical vortex generators(VGs)on the cavitation dynamics around a hydrofoil *** addition,the pressure pulsations induced by the collapse of the cavity structures in the wake region of the hydrofoil were captured with a pressure transducer mounted on the wall downstream of the *** results showed that the instability behaviors of the cavity structures on the hydrofoil were mitigated using the proposed cavitation passive control *** addition,the pressure pulsations in the wake region of the hydrofoil were reduced *** can be concluded that the suppression of cavitation instabilities can improve the operating life and reliability of the marine and hydraulic systems.

关键词： hydrodynamic cavitation cavitation passive control hemispherical vortex generators pressure pulsations high speed observation

An experimental study on size distribution and zeta potential of bulk cavitation nanobubbles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 152-161页

作者： Xu-yu Zhang Qian-shuai Wang Zhong-xian Wu Dong-ping Tao School of Mining Engineering University of Science and Technology LiaoningAnshan 114051China School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255049China

Nanobubble flotation technology is an important research topic in the field of fine mineral particle *** basic characteristics of nanobubbles,including their size,concentration,surface zeta potential,and stability have a significant impact on the nanobubble flotation *** this paper,bulk nanobubbles generated based on the principle of hydrodynamic cavitation were investigated to determine the effects of different parameters(e.g.,surfactant(frother)dosage,air flow,air pressure,liquid flow rate,and solution pH value)on their size distribution and zeta potential,as measured using a nanoparticle *** results demonstrated that the nanobubble size decreased with increasing pH value,surfactant concentration,and cavitation-tube liquid flow rate but increased with increasing air pressure and increasing air flow *** magnitude of the negative surface charge of the nanobubbles was positively correlated with the pH value,and a certain relationship was observed between the zeta potential of the nanobubbles and their *** structural parameters of the cavitation tube also strongly affected the characteristics of the *** results of this study offer certain guidance for optimizing the nanobubble flotation technology.

关键词： nanobubble hydrodynamic cavitation zeta potential size distribution