摘要：
Nanofluids have exposed a significant promise in the thermal development of several industrial systems, and at the same time, the flow via needle has major applications in modern construction systems including microstructure electric gadgets and microscale cooling gadgets for thermal migration applications. According to these applications, the current investigation concentrates to deliberate on 2D steady, laminar and incompressible flow of magneto-Cross nanofluid towards the region of moving thin needle in the occurrence of Darcy–Forchheimer porous medium, Ohmic and viscous dissipation with chemical reaction and mixed convection. The new dimensionless similarity variables are introduced to convert the nonlinear expressions governing the flow and transfer of heat. The change in velocity, thermal and concentration profiles for various non-dimensional parameters is deliberated briefly and illustrated with the help of suitable plots. Further, analysis of skin friction and rate of heat transfer is done through graphs. The results obtained are validated by existing works and are found to have a good agreement. The result outcome reveals that advanced values of magnetic parameter and Weissenberg number slowdown the fluid velocity motion. Also, upshot in Brownian motion and thermophoresis parameters improves the thermal profile.
作者：
Zhang, Xiao-Hong;Saeed, Tareq;Algehyne, Ebrahem A.;El-Shorbagy, M. A.;El-Refaey, Adel M.;...
期刊：
Scientific Reports,2021年11(1) ISSN：2045-2322
通讯作者：
M. A. El-Shorbagy<&wdkj&>Muhammad Ibrahim
作者机构：
[Zhang, Xiao-Hong] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Saeed, Tareq] King Abdulaziz Univ, Fac Sci, Dept Math, Nonlinear Anal & Appl Math NAAM Res Grp, POB 80203, Jeddah 21589, Saudi Arabia.;[Algehyne, Ebrahem A.] Univ Tabuk, Fac Sci, Dept Math, POB 741, Tabuk 71491, Saudi Arabia.;[El-Shorbagy, M. A.] Prince Sattam Bin Abdulaziz Univ, Coll Sci & Humanities Al Kharj, Dept Math, Al Kharj 11942, Saudi Arabia.;[El-Shorbagy, M. A.] Menoufia Univ, Fac Engn, Dept Basic Engn Sci, Shibin Al Kawm 32511, Egypt.
通讯机构：
[M. A. El-Shorbagy] D;[Muhammad Ibrahim] S;School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, People’s Republic of China<&wdkj&>Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia<&wdkj&>Department of Basic Engineering Science, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt
摘要：
In this paper, the natural convection heat transfer of water/alumina nanofluid is investigated in a closed square cavity. An oblique magnetic field is applied on the cavity of angle $$\gamma$$ . There is also radiation heat transfer in the cavity. The cavity includes a high-temperature source of L-shape. A low-temperature source as a quadrant of a circle is placed at the corner of the cavity. All other walls are well insulated. The novelty of this work is a low-temperature obstacle embedded in the cavity. Simulations are conducted with a Fortran code based on the control volume method and simple algorithm. Entropy generation rate, Bejan number, and heat transfer are studied by changing different parameters. Results indicate that the highest rates of heat transfer and entropy generation have occurred for the perpendicular magnetic field at high values of the Rayleigh number. At these Rayleigh numbers, the minimum value of the Bejan number is obtained for 15° magnetic field. The magnetic field variation can lead to a change up to 53% in Nusselt number and up to 34% in generated entropy. In a weak magnetic field, the involvement of the radiation heat transfer mechanism leads to an increase in the heat transfer rate so that the Nusselt number can be increased by ten units considering the radiation heat transfer when there is no magnetic field. The maximum heat transfer rate occurs in the horizontal cavity and the minimum value in the cavity of 60° angle. For water, these values are 10.75 and 9.98 for 0 and 60 angles, respectively. Moreover, a weak magnetic field increases the heat transfer rate in the absence of the radiation mechanism, while it is reduced by considering a strong magnetic field.
期刊：
Journal of Molecular Liquids,2021年335:116137 ISSN：0167-7322
通讯作者：
Hu Ge-JiLe<&wdkj&>Mahmoud Mohamed Selim
作者机构：
[Zhou, Shuang-Shuang] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Almarashi, Adel] Jazan Univ, Coll Sci, Dept Math, Post Box 2097,New Campus, Jazan, Saudi Arabia.;[Dara, Rebwar Nasir] Salahaddin Univ Erbil, Coll Sci, Dept Geol, Erbil, Iraq.;[Dara, Rebwar Nasir] Knowledge Univ, Coll Engn, Dept Petr Engn, Erbil, Kurdistan Regio, Iraq.;[Issakhov, Alibek] Al Farabi Kazakh Natl Univ, Dept Math & Comp Modeling, Alma Ata, Kazakhstan.
通讯机构：
[Hu Ge-JiLe] S;[Mahmoud Mohamed Selim] D;School of Science, Huzhou University, Huzhou 313000, PR China<&wdkj&>Department of Mathematics, Al-Aflaj College of Science and Humanities Studies, Prince Sattam bin Abdulaziz University, Al-Aflaj 710-11912, Saudi Arabia<&wdkj&>Department of Mathematics, Suez Faculty of Science, Suez University, Egypt
关键词：
Magnetic force;Permeable space;Convection;Hybrid nano powder
摘要：
Complex cavity permeated with permeable media was influenced by magnetic field in current modeling. The flow encounters resistance in existence of Lorentz force and to improve thermal features, water was equipped with nano powders. Induce magnetic was ignored and to harness the permeability effect, non-Darcy approach was used. Current model acquired large attention in industry. For examine the correctness of code, the results of 0 was compared with previous basic article and achieved graph illustrates nice conformity of current modeling. Two straight wall were adiabatic, lower and upper walls were confined to hot and cold temperature bath. Laminar flow was established and maximum of Ra is 10(5) and carrier fluid is incompressible. To incorporate the gravity force, Boussinesq principle was utilized. The bottom surface was subjected to hot source and gravity enforces the nanomaterial to go up and create rotating cell. The complex shape of isotherms pertains to stronger convection which is attributed to greater permeability. Involve of MHD, declines the distortion of isotherms and conduction becomes stronger in greater Ha. Rise of Ha leads to decrease in Psi about 60% when Da = 100. Psi augments about 100% with augment of Da when Ha = 0. Rise of Ha provides reduction in Nu about 11.48% and 9.37% when Da = 100 and 0.01, respectively. Rise of Rd offers 106.6% augmentation in Nu when Ha = 0. When Ha = 20 and Da = 100, rise of Ra leads to 99% augmentation in Nu. (C) 2021 Elsevier B.V. All rights reserved.
作者：
Zhang, Xiao-Hong;Abidi, Awatef;Ahmed, A. El-Sayed;Khan, M. Riaz;El-Shorbagy, M. A.;...
期刊：
Case Studies in Thermal Engineering,2021年26 ISSN：2214-157X
通讯作者：
Khan, M.R.
作者机构：
[Zhang, Xiao-Hong] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Abidi, Awatef] King Khalid Univ, Coll Sci Abha, Phys Dept, Abha, Saudi Arabia.;[Abidi, Awatef] Monastir Univ, Energy Engn Dept, Natl Engn Sch, Res Lab Metrol & Energy Syst, Monastir City, Tunisia.;[Abidi, Awatef] Sousse Univ, Higher Sch Sci & Technol Hammam Sousse, Sousse, Tunisia.;[Ahmed, A. El-Sayed] Taif Univ, Fac Sci, Math Dept, POB 11099, At Taif 21944, Saudi Arabia.
作者：
Xiong, Pei-Ying;Javid, Khurram;Raza, Mohsin;Khan, Sami Ullah;Khan, M. Ijaz;...
期刊：
理论物理,2021年73(8):085001 ISSN：0253-6102
通讯作者：
Chu, Y.-M.
作者机构：
[Xiong, Pei-Ying] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Raza, Mohsin; Javid, Khurram] Northern Univ, Dept Math, Kaka Saib Rd, Nowshera 24110, Kpk, Pakistan.;[Khan, Sami Ullah] COMSATS Univ Islamabad, Dept Math, Sahiwal 57000, Pakistan.;[Khan, M. Ijaz] Riphah Int Univ, Dept Math & Stat, I-14, Islamabad 44000, Pakistan.;[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.
通讯机构：
[Chu, Y.-M.] D;Department of Mathematics, China
关键词：
magnetic field;peristaltic waves;porous medium;pumping phenomena;secondorder slip condition
摘要：
The steady laminar flow of viscous fluid from a curved porous domain under a radial magnetic field is considered. The fluid flow by a curved domain is due to peristaltic waves present at the boundary walls. The whole analysis is based on porosity (Darcy number) effects. Moreover, the effects of second-order slip on the rheology analysis are also discussed. Due to the complex nature of the flow regime, we have governed the rheological equations by using curvilinear coordinates in the fixed frame. The physical influence of magnetic (Hartmann number) and porosity (Darcy number) parameters on the rheological features of peristaltic transportation are argued in detailed (in the wave frame). Additionally, in the current study, the complex wavy pattern on both boundary walls of the channel is used. The whole rheological study is based on ancient, but medically valid, assumptions of creeping phenomena and long wavelength assumptions. Analytical solutions of the governing equations are obtained by using the simple integration technique in Mathematica software 11.0. The core motivation of the present analysis is to perceive the physical influence of embedded parameters, such as the dimensionless radius of the curvature parameter, magnetic parameter, porosity parameter, different amplitude ratios of complex peristaltic waves, first- and second-order slip parameters, on the axial velocity, pressure gradient, local wall shear stress, tangential component of the extra-stress tensor, pumping and trapping phenomena.
期刊：
International Journal of Pattern Recognition and Artificial Intelligence,2021年35(15):2152023 ISSN：0218-0014
通讯作者：
Hean Liu<&wdkj&>Young Chun Ko
作者机构：
[Ko, Young Chun] Department of Teaching Profession, Sehan University, Chonnam 58447, Korea;College of Science, Hunan City University, Yiyang Hunan 413000, P. R. China;Graduate School of Sehan University, Chonnam 58447, Korea;[Liu, Hean] College of Science, Hunan City University, Yiyang Hunan 413000, P. R. China<&wdkj&>Graduate School of Sehan University, Chonnam 58447, Korea
通讯机构：
[Hean Liu] C;[Young Chun Ko] D;Department of Teaching Profession, Sehan University, Chonnam 58447, Korea<&wdkj&>College of Science, Hunan City University, Yiyang Hunan 413000, P. R. China<&wdkj&>Graduate School of Sehan University, Chonnam 58447, Korea
摘要：
This paper proposes a research on cross-media intelligent perception and retrieval analysis technology based on deep learning education in view of the complex learning knowledge environment of artificial intelligence of traditional cross-media retrieval technology, which is unable to obtain retrieval information timely and accurately. Based on the cross-media theory, this paper analyzes the pre-processing of cross-media data, transforms from a single media form such as text, voice, image, and video to a cross-media integration covering network space and physical space, and designs a cross-media intelligent perception platform system. With multi-core method of typical correlation analysis algorithm, this paper develops a new joint learning framework based on the joint feature selection and subspace learning cross-modal retrieval. What’s more, the algorithm is tested experimentally. The results show that the retrieval analysis technology is significantly better than the traditional media retrieval technology, which can effectively identify text semantics and visual image classification, and can better maintains the relevance of data content and the consistency of semantic information, which has important reference value for cross-media applications.
作者：
Song, Ying-Qing;Waqas, Hassan;Khan, Shan Ali;Khan, Sami Ullah;Khan, M. Ijaz;...
期刊：
International Communications in Heat and Mass Transfer,2021年126:105351 ISSN：0735-1933
通讯作者：
Yu-Ming Chu
作者机构：
[Song, Ying-Qing] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.;[Waqas, Hassan; Khan, Shan Ali] Univ Faisalabad, Govt Coll, Dept Math, Layyah Campus, Faisalabad 31200, Pakistan.;[Khan, Sami Ullah] COMSATS Univ Islamabad, Dept Math, Sahiwal 57000, Pakistan.;[Khan, M. Ijaz] Riphah Int Univ I 14, Dept Math & Stat, Islamabad 44000, Pakistan.;[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.
通讯机构：
[Yu-Ming Chu] D;Department of Mathematics, Huzhou University, Huzhou 313000, PR China<&wdkj&>Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science & Technology, Changsha 410114, PR China
摘要：
The novel aim of current analysis is to identify the characteristics of Arrhenius activation energy and nonlinear thermal radiation in bio-convective brinkman type micropolar nanofluid flow with gyrotactic motile microorganisms and melting phenomena through a stretched surface. The temperature dependent heat source/sink and exponential space-based thermal source are considered. Further, concentration of nano-materials and thermal fields are considered in the occurrence of Brownian motion and thermophoresis diffusion. The narrating boundary layer flow equations of brinkman type micropolar fluid model are reframed on the form of ordinary ones with the help of appropriate similarity transformation. The bvp4c collocation technique is used in the transformed model with shooting scheme to obtain a numerical solution of the original problem. The numerical data for the velocity, thermal and solutal fields, and microorganism's field is graphically designed and impacts of the prominent parameters are described in detail. It is notice from the current study velocity of fluid has diverse nature against magnetic parameter. Growing behavior of velocity field is depicted for higher estimation of mixed convection parameter. The microorganism field is boosted up by increasing melting parameter. The current model is applicable in nanotechnology, biotechnology, drug delivery, protein chips, DNA chips, food processing, cancer treatment, smart sensors and in many more fields
期刊：
FIXED POINT THEORY,2021年22(2):913-931 ISSN：1583-5022
通讯作者：
Ma, Q.
作者机构：
[Ma, Qiang; Ding, Xiaohua] Department of Mathematics, Harbin Institute of Technology at Weihai, Weihai, 264209, China;School of Mathematics and Computational Science, Hunan City University, Yiyang, 413000, China;[Yan, Rian] Department of Mathematics, Harbin Institute of Technology at Weihai, Weihai, 264209, China, School of Mathematics and Computational Science, Hunan City University, Yiyang, 413000, China
通讯机构：
[Ma, Q.] D;Department of Mathematics, China
关键词：
Boundary value problem;Fixed-point theorem;Fractional differential equation
关键词：
Key Words and Phrases;fractional evolution equations;admissible "state control" pair;density;co-density
摘要：
In this paper, we discuss a class of Caputo fractional evolution equations on Banach space with feedback control constraint whose value is non-convex closed in the control space. First, we prove the existence of solutions for the system with feedback control whose values are the extreme points of the convexified constraint that belongs to the original one. Secondly, we study the topological properties of the sets of admissible “state-control” pair for the original system with various feedback control constraints and the relations between them. Moreover, we obtain necessary and sufficient conditions for the solution set of original systems to be closed. In the end, an example is given to illustrate the applications of our main results.
