This paper concerns the characteristics of heat and mass transfer in upper convected Maxwell fluid flow over a linear stretching sheet with solar radiation,viscous desperation and temperature based viscosity.After bou...This paper concerns the characteristics of heat and mass transfer in upper convected Maxwell fluid flow over a linear stretching sheet with solar radiation,viscous desperation and temperature based viscosity.After boundary layer approximation,the governing equations are achieved(namely Maxwell,upper convected material derivative,thermal and concentration diffusions).By using the self-similarity transformations the governing PDEs are converted into nonlinear ODEs and solved by RK-4 method in combination with Newton Raphson(shooting technique).The effects of developed parameters on velocity,temperature,concentration,fraction factor,heat and mass diffusions are exemplified through graphs and tabular form and are deliberated in detail.Numerical values of fraction factor,heat and mass transfer rates with several parameters are computed and examined.It is noticed that the temperature is more impactable for higher values of radiative heat transport,thermal conductivity and viscous dissipation.The comparison data for some limiting case are acquired and are originated to be in good agreement with previously published articles.展开更多
Nitrided- iron nanometer powder is prepared by thermal chemical vapor- phase reaction method,using Fe Cl2 · n H2 O and NH3 as starting material.The physical properties of the powder is measured by means of XRD,XP...Nitrided- iron nanometer powder is prepared by thermal chemical vapor- phase reaction method,using Fe Cl2 · n H2 O and NH3 as starting material.The physical properties of the powder is measured by means of XRD,XPS,TEM,VSM etc,and physical phase shape, size and magneticpropertiesof the powderis also characterized.Experimentresults show ni- trided- iron ultrafine powder of uniform,high pure,chain- of- spherical and high magnetics can be prepared by improving synthesis reaction instrument.The physical property index of the powder prepared in this instrumentis preferable to Tanaka′s same study results.展开更多
采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧...采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧化动力学曲线,对涂层的热震性能进行分析。结果表明,喷涂Al_2O_3陶瓷料浆能有效填补Ni Cr Al Y喷涂层产生的裂纹,涂层与金属基体之间呈冶金结合,α-Al_2O_3和金红石型Ti O_2是陶瓷涂层耐高温的主体晶相结构。2~#涂层表现出最佳的抗高温氧化性能和抗热震性能。展开更多
Comparison between unsteady and steady MHD Buongiorno’s model Williamson nanoliquid flow through a wedge with slip effects,chemical reaction and radiation is made in this analysis.Thermophoresis and Brownian motion a...Comparison between unsteady and steady MHD Buongiorno’s model Williamson nanoliquid flow through a wedge with slip effects,chemical reaction and radiation is made in this analysis.Thermophoresis and Brownian motion are also considered in this study.Appropriate similarity variables are presented to transmute the governing PDEs into the set of non-linear ODEs.The most widely authenticated finite element method is implemented to analyze these set of ODEs numerically.The behavior of concentration,temperature and velocity sketches for varied values of relevant parameters is numerically calculated and the outcomes are plotted through graphs.The numerical values of dimensionless rates of mass transfer,heat and velocity are also evaluated and depicted through tables.It is noted that with upsurging values of angle of wedge parameter,the distributions of temperature of the liquid intensify in both steady and unsteady cases.展开更多
The current paper explores the behavior of the thermal radiation on the time-independent flow of mi-cropolar fluid past a vertical stretching surface with the interaction of a transverse magnetic field.The ef-fect of ...The current paper explores the behavior of the thermal radiation on the time-independent flow of mi-cropolar fluid past a vertical stretching surface with the interaction of a transverse magnetic field.The ef-fect of thermo-diffusion(Soret)along with the heat source is incorporated to enhance the thermal prop-erties.Also,the convective solutal condition is considered that affects the mass transfer phenomenon.The transformed equations are modeled using suitable similarity transformation.However,the complex cou-pled equations are handled mathematically employing the Runge-Kutta-Felhberg method.The behavior of characterizing parameters on the flow phenomena as well as the engineering coefficients are displayed via graphs and the validation of the current outcome is reported with the previously published results in particular cases.展开更多
基金funding this work through research groups program under grant number R.G.P-59/40.
文摘This paper concerns the characteristics of heat and mass transfer in upper convected Maxwell fluid flow over a linear stretching sheet with solar radiation,viscous desperation and temperature based viscosity.After boundary layer approximation,the governing equations are achieved(namely Maxwell,upper convected material derivative,thermal and concentration diffusions).By using the self-similarity transformations the governing PDEs are converted into nonlinear ODEs and solved by RK-4 method in combination with Newton Raphson(shooting technique).The effects of developed parameters on velocity,temperature,concentration,fraction factor,heat and mass diffusions are exemplified through graphs and tabular form and are deliberated in detail.Numerical values of fraction factor,heat and mass transfer rates with several parameters are computed and examined.It is noticed that the temperature is more impactable for higher values of radiative heat transport,thermal conductivity and viscous dissipation.The comparison data for some limiting case are acquired and are originated to be in good agreement with previously published articles.
文摘Nitrided- iron nanometer powder is prepared by thermal chemical vapor- phase reaction method,using Fe Cl2 · n H2 O and NH3 as starting material.The physical properties of the powder is measured by means of XRD,XPS,TEM,VSM etc,and physical phase shape, size and magneticpropertiesof the powderis also characterized.Experimentresults show ni- trided- iron ultrafine powder of uniform,high pure,chain- of- spherical and high magnetics can be prepared by improving synthesis reaction instrument.The physical property index of the powder prepared in this instrumentis preferable to Tanaka′s same study results.
文摘采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧化动力学曲线,对涂层的热震性能进行分析。结果表明,喷涂Al_2O_3陶瓷料浆能有效填补Ni Cr Al Y喷涂层产生的裂纹,涂层与金属基体之间呈冶金结合,α-Al_2O_3和金红石型Ti O_2是陶瓷涂层耐高温的主体晶相结构。2~#涂层表现出最佳的抗高温氧化性能和抗热震性能。
文摘Comparison between unsteady and steady MHD Buongiorno’s model Williamson nanoliquid flow through a wedge with slip effects,chemical reaction and radiation is made in this analysis.Thermophoresis and Brownian motion are also considered in this study.Appropriate similarity variables are presented to transmute the governing PDEs into the set of non-linear ODEs.The most widely authenticated finite element method is implemented to analyze these set of ODEs numerically.The behavior of concentration,temperature and velocity sketches for varied values of relevant parameters is numerically calculated and the outcomes are plotted through graphs.The numerical values of dimensionless rates of mass transfer,heat and velocity are also evaluated and depicted through tables.It is noted that with upsurging values of angle of wedge parameter,the distributions of temperature of the liquid intensify in both steady and unsteady cases.
文摘The current paper explores the behavior of the thermal radiation on the time-independent flow of mi-cropolar fluid past a vertical stretching surface with the interaction of a transverse magnetic field.The ef-fect of thermo-diffusion(Soret)along with the heat source is incorporated to enhance the thermal prop-erties.Also,the convective solutal condition is considered that affects the mass transfer phenomenon.The transformed equations are modeled using suitable similarity transformation.However,the complex cou-pled equations are handled mathematically employing the Runge-Kutta-Felhberg method.The behavior of characterizing parameters on the flow phenomena as well as the engineering coefficients are displayed via graphs and the validation of the current outcome is reported with the previously published results in particular cases.
