Time-Dependent Stagnation Point Flow of Water Conveying Titanium Dioxide Nanoparticle Aggregation on Rotating Sphere Object Experiencing Thermophoresis Particle Deposition Effects

Energies

Umair Khan¹  Sunitha Madireddy²  Zehba Raizah³  Javali K. Madhukesh⁴  Ballajja C. Prasannakumara⁴  Ahmed M. Galal⁵ 

[1] Department of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia;Department of Mathematics and Statistics, University College for Women, Koti 500095, Hyderabad, India;Department of Mathematics, College of Science, King Khalid University, Abha 61421, Saudi Arabia;Department of Studies and Research in Mathematics, Davangere University, Davangere 577002, Karnataka, India;Mechanical Engineering Department, College of Engineering, Prince Sattam Bin Abdulaziz University, Wadi Addawaser 11991, Saudi Arabia;

关键词: nanofluid;    nanofluid aggregation;    thermophoretic particle deposition;    stagnation point flow;    rotating sphere;   

DOI  :  10.3390/en15124424

来源: DOAJ

【 摘 要 】

The notion of thermophoretic particle deposition is used in a number of applications, including thermal exchanger walls. It is important to identify the transport processes in action in systems such as thermal precipitators, exhaust devices, optical transmission fabrication processes, and so on. Based on these application points of view, the present work studies the performance of nanoparticle aggregation stagnation point flow over a rotating sphere during the occurrence of thermophoretic particle deposition. The nonlinear governing equations are transformed into the ordinary differential equation by utilizing suitable similarity variables. The numerical outcomes of the reduced equations along with boundary conditions are solved by the Runge–Kutta–Fehlberg 45 (RKF-45) order method with shooting procedure. The numerical results are shown with the assistance of graphs. The impacts of various dimensionless constraints on velocity, thermal, and concentration profiles are studied under the occurrence and absence of nanoparticle aggregation. The study reveals that the primary velocity is enhanced with increasing values of the acceleration parameter, but secondary velocity diminishes. The impressions of the rotation parameter will improve the primary velocity. The concentration profiles will diminish with an improvement in the thermophoretic parameter. The surface drag force is greater in nanoparticles with aggregation than nanoparticles without aggregation in the $C_{fx}$ case but a reverse behavior is seen in the $C_{fz}$ case. Further, the rate of heat distribution increases with a rise in the solid volume fraction, whereas the rate of mass distribution grows as the thermophoretic parameter grows.

【 授权许可】

Unknown