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Physiological Basis of Stagnant Flooding Tolerance in Rice

Rice science 2017年第2期24卷 73-84页

作者： Sandhya R.KUANAR Anuprita RAY Santosh K.SETHI krishnendu chattopadhyay Ramani K.SARKAR Crop Physiology&Biochemistry Division National Rice Research InstituteCuttack 753006India

Stagnant flooding(SF) is an important constraint which prolonges partial submergence damages of rice plants and reduces grain yield. Due to the heterogeneity in flood-prone ecosystem, many different types of traditional rice varieties are being grown by the farmers. The local landraces adapted to extreme in water availability could be the sources of new gene(s) which would be utilized to improve the adaptability of rice to SF with high yield. The main goal of this study is to identify new genetic resources tolerant to SF based on morpho-physiological traits. A total of 16 rice varieties were selected after initial screening from more than 400 rice varieties which were collected from eastern states of India. The increase rate of plant height was higher under SF compared to control, whereas no such trend was observed in the increment rate of aboveground total dry weight and culm dry weight. Area of aerenchyma gas spaces per tiller increased whereas root oxidase activity decreased under SF. The reduction of root oxidase activity, leaf area, and leaf dry weight was higher in susceptible varieties under SF compared to control. Stability index for different grain yield and yield attributes revealed that the impact of SF differed among different varieties. Correlation coefficient studies among different parameters taking stability index showed significant association with the grain yield. Based on the findings, it was concluded that maintenance of equivalent panicle weight and panicle number, plant height and harvest index at the maturity stage, leaf area, leaf and culm dry weights, root oxidase activity and tiller numbers at the flowering stage under SF compared to control help the plant to counteract the adverse effects of SF.

关键词： morpho-physiological trait rice stagnant flooding yield

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Dual Solutions in Unsteady Stagnation-Point Flow over a Shrinking Sheet

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Chinese Physics Letters 2011年第8期28卷 165-168页

作者： krishnendu Bhattacharyya Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia

An analysis is made to study the dual nature of solution of unsteady stagnation-point flow due to a shrinking *** similarity transformations,the governing boundary layer equations are transformed into the self-similar nonlinear ordinary differential *** transformed equations are solved numerically using a very efficient shooting *** study reveals the conditions of existence,uniqueness and non-existence of unsteady similarity *** dual solutions for velocity distribution exist for certain values of velocity ratio parameter(c/a),and the increment in the unsteadiness parameter A increases the range of c/a where solution ***,with increasing A,the skin friction coefficient increases for the first solution and decreases for the second.

关键词： solution method unsteady

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Heat transfer in boundary layer stagnation-point flow towards a shrinking sheet with non-uniform heat flux

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Chinese Physics B 2013年第7期22卷 328-333页

作者： krishnendu Bhattacharyya Department of Mathematics The University of Burdwan

In this paper, the effect of non-uniform heat flux on heat transfer in boundary layer stagnation-point flow over a shrinking sheet is studied. The variable boundary heat fluxes are considered of two types： direct power-law variation with the distance along the sheet and inverse power-law variation with the distance. The governing partial differential equations （PDEs） are transformed into non linear self-similar ordinary differential equations （ODEs） by similarity transformations, and then those are solved using very efficient shooting method. The direct variation and inverse variation of heat flux along the sheet have completely different effects on the temperature distribution. Moreover, the heat transfer characteristics in the presence of non-uniform heat flux for several values of physical parameters are also found to be interesting.

关键词： non-uniform heat flux heat transfer stagnation-point flow shrinking sheet

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Boundary Layer Flow and Heat Transfer over an Exponentially Shrinking Sheet

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Chinese Physics Letters 2011年第7期28卷 198-201页

作者： krishnendu Bhattacharyya Department of Mathematics the University of BurdwanBurdwan-713104West BengalIndia

An analysis is made to study boundary layer flow and heat transfer over an exponentially shrinking *** similarity transformations in exponential form,the governing boundary layer equations are transformed into self-similar nonlinear ordinary differential equations,which are then solved numerically using a very efficient shooting *** analysis reveals the conditions for the existence of steady boundary layer flow due to exponential shrinking of the sheet and it is found that when the mass suction parameter exceeds a certain critical value,steady flow is *** dual solutions for velocity and temperature distributions are *** increasing values of the mass suction parameter,the skin friction coefficient increases for the first solution and decreases for the second solution.

关键词： solution method exponential

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Heat transfer for boundary layers with cross flow

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Chinese Physics B 2014年第2期23卷 327-332页

作者： krishnendu Bhattacharyya Ioan Pop Department of Mathematics The University of Burdwan Faculty of Mathematics Babes-Bolyai University

An analysis is presented to study the dual nature of solutions for the forced convective boundary layer flow and heat transfer in a cross flow with viscous dissipation terms in the energy equation. The governing equations are transformed into a set of three self-similar ordinary differential equations by similarity transformations. These equations are solved numerically using the very efficient shooting method. This study reveals that the dual solutions of the transformed similarity equations for velocity and temperature distributions exist for certain values of the moving parameter, Prandtl number, and Eckert numbers. The reverse heat flux is observed for larger Eckert numbers; that is, heat absorption at the wall occurs.

关键词： heat transfer boundary layer cross flow viscous dissipation dual solutions

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Analytic solution for magnetohydrodynamic boundary layer flow of Casson fluid over a stretching/shrinking sheet with wall mass transfer

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Chinese Physics B 2013年第2期22卷 314-319页

作者： krishnendu Bhattacharyya Tasawar Hayat Ahmed Alsaedi Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia Department of Mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

In this analysis,the magnetohydrodynamic boundary layer flow of Casson fluid over a permeable stretching/shrinking sheet in the presence of wall mass transfer is *** similarity transformations,the governing equations are converted to an ordinary differential equation and then solved *** introduction of a magnetic field changes the behavior of the entire flow dynamics in the shrinking sheet case and also has a major impact in the stretching sheet *** similarity solution is always unique in the stretching case,and in the shrinking case the solution shows dual nature for certain values of the *** stronger magnetic field,the similarity solution for the shrinking sheet case becomes unique.

关键词： magnetohydrodynamic boundary layer Casson fluid stretching/shrinking sheet wall mass transfer analytic solution

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Unsteady boundary layer flow and heat transfer over an exponentially shrinking sheet with suction in a copper-water nanofluid

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Journal of Central South University 2015年第12期22卷 4856-4863页

作者： Aurang Zaib krishnendu Bhattacharyya Sharidan Shafie Department of Mathematical Sciences Federal Urdu University of ArtsScience & Technology Department of Mathematics The University of Burdwan Department of Mathematical Sciences Faculty of ScienceUniversiti Teknologi Malaysia

An analysis of unsteady boundary layer flow and heat transfer over an exponentially shrinking porous sheet filled with a copper-water nanofluid is *** is treated as a base *** the investigation,non-uniform mass suction through the porous sheet is *** Keller-box method the transformed equations are solved *** results of skin friction coefficient,the local Nusselt number as well as the velocity and temperature profiles are presented for different flow *** results showed that the dual non-similar solutions exist only when certain amount of mass suction is applied through the porous sheet for various unsteady parameters and nanoparticle volume *** ranges of suction where dual non-similar solution exists,become larger when values of unsteady parameter as well as nanoparticle volume fraction ***,due to unsteadiness of flow dynamics and the presence of nanoparticles in flow field,the requirement of mass suction for existence of solution of boundary layer flow past an exponentially shrinking sheet is ***,the velocity boundary layer thickness decreases and thermal boundary layer thickness increases with increasing of nanoparticle volume fraction in both non-similar ***,for stronger mass suction,the velocity boundary layer thickness becomes thinner for the first solution and the effect is opposite in the case of second *** temperature inside the boundary layer increases with nanoparticle volume fraction and decreases with mass ***,for the unsteadiness and for the presence of nanoparticles,the flow separation is delayed to some extent.

关键词： unsteady boundary layer heat transfer nanofluid exponentially shrinking sheet dual non-similar solutions

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Effects of radiation and heat source/sink on unsteady MHD boundary layer flow and heat transfer over a shrinking sheet with suction/injection

引用

Frontiers of Chemical Science and Engineering 2011年第3期5卷 376-384页

作者： krishnendu Bhattacharyya Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia

In this paper,an investigation is made to study the effects of radiation and heat source/sink on the unsteady boundary layerﬂow and heat transfer past a shrinking sheet with suction/***ﬂow is permeated by an externally applied magneticfield normal to the plane ofﬂ*** self-similar equations correspond-ing to the velocity and temperaturefields are obtained,and then solved numerically byfinite difference method using quasilinearization *** study reveals that the momentum boundary layer thickness increases with increasing unsteadiness and decreases with *** thermal boundary layer thickness decreases with Prandtl number,radiation parameter and heat sink parameter,but it increases with heat source ***,increasing unsteadiness,magneticfield strength,radiation and heat sink strength boost the heat transfer.

关键词： MHD boundary layer unsteadyﬂow heat transfer thermal radiation heat source/sink shrinking sheet suction/injection

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Dual solutions in boundary layer flow of Maxwell fluid over a porous shrinking sheet

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Chinese Physics B 2014年第12期23卷 289-292页

作者： krishnendu Bhattacharyya Tasawar Hayat Ahmed Alsaedi Department of Mathematics The University of Burdwan Department of Mathematics Quaid-I-Azam University Department of Mathematics Faculty of Science King Abdulaziz University

An analysis is carried out for dual solutions of the boundary layer flow of Maxwell fluid over a permeable shrinking sheet. In the investigation, a constant wall mass transfer is considered. With the help of similarity transformations, the governing partial differential equations（PDEs） are converted into a nonlinear self-similar ordinary differential equation（ODE）. For the numerical solution of transformed self-similar ODE, the shooting method is applied. The study reveals that the steady flow of Maxwell fluid is possible with a smaller amount of imposed mass suction compared with the viscous fluid flow. Dual solutions for the velocity distribution are obtained. Also, the increase of Deborah number reduces the boundary layer thickness for both solutions.

关键词： dual solutions boundary layer flow Maxwell fluid porous shrinking sheet

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Exact solutions for the flow of Casson fluid over a stretching surface with transpiration and heat transfer effects

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Chinese Physics B 2013年第11期22卷 356-361页

作者： Swati Mukhopadhyay krishnendu Bhattacharyya Tasawar Hayat Department of Mathematics The University of Burdwan Department of Mathematics Quaid-i-Azam University 45320 Department of Mathematics Faculty of Science King Abdulziz University

The effects of transpiration on forced convection boundary layer non-Newtonian fluid flow and heat transfer toward a linearly stretching surface are reported. The flow is caused solely by the stretching of the sheet in its own plane with a velocity varying linearly with the distance from a fixed point. The constitutive relationship for the Casson fluid is used. The governing partial differential equations corresponding to the momentum and energy equations are converted into non-linear ordinary differential equations by using similarity transformations. Exact solutions of the resulting ordinary differential equations are obtained. The effect of increasing Casson parameter, i.e., with decreasing yield stress （the fluid behaves as a Newtonian fluid as the Casson parameter becomes large）, is to suppress the velocity field. However, the temperature is enhanced as the Casson parameter increases. It is observed that the effect of transpiration is to decrease the fluid velocity as well as the temperature. The skin-friction coefficient is found to increase as the transpiration parameter increases.

关键词： stretching surface transpiration Casson fluid heat transfer

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