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نتیجه جستجو - Vortex

تعداد مقالات یافته شده: 6
ردیف عنوان نوع
1 A review on heat enhancement in thermal energy conversion and management using Field Synergy Principle
مروری بر افزایش گرما در تبدیل انرژی و مدیریت انرژی حرارتی با استفاده از اصل فیلد سینرژی-2020
How to improve the efficiency of heat transport, conversion and management has been the research focus of thermal energy application and related disciplines. Since the Field Synergy Principle theory was put forward, it has been further studied and developed in a wider scope which is an effective research method for enhancing convective heat transfer and other heat transfer processes. This paper investigated the optimization applications in thermal transfer such as heat exchangers, fuel cell, porous medium, solar energy receiver vortex generators and diesel particulate filter, which can improve the heat transfer performance significantly. The field synergy direct application can improve the heat transfer capacity of the finned heat exchanger remarkably with a 7% increase of heat transfer capability and about 14.4% less aluminum for the fin. The heat transfers efficient of the wave fin with elliptic improved 30% with the larger averaged intersection angle compared to wavy fin after field synergy optimized. Better use effects have emphasized the utilization of the synergy approaches to enhance the heat transfer combined with other theories, the total time rates of entropy generation are 7.3×10−2 W·K−1 and that is 8.2×10−2 W·K−1 after field synergy and minimum entropy generation principle majorization with the same viscous dissipation of 2.4×10−8 W. The research results explore extensions of the field synergy theory highly desirable attributes to more diverse and broader applications, which provide a way of thinking and research method for the further thermal energy conversion and management development as far as possible.
Keywords: Field Synergy Principle | Convective heat transfer | Heat transfer | Energy conversion and management | Heat enhancement
مقاله انگلیسی
2 Deep learning enabled cutting tool selection for special-shaped machining features of complex products
یادگیری عمیق انتخاب ابزار برش را برای ویژگی های ماشینکاری خاص محصولات پیچیده امکان پذیر می کند-2019
Each complex product contains many special-shaped machining features required to be machined by the specific customized cutting tools. In this context, we propose a deep learning based cutting tool selection approach, which contributes to make it effective and efficiency for and also improves the intelligence of the process of cutting tool selection for special-shaped machining features of complex products. In this approach, one-to-one correspondence between each special-shaped machining feature and each cutting tool is first analyzed and established. Then, the problem of cutting tool selection could be transformed into a feature recognition problem. To this end, each special-shaped machining feature is represented by its multiple drawing views that contain rich information for differentiating each of these features. With numbers of these views as training set, a deep residual network (ResNet) is trained successfully for feature recognition, where the recognized features cutting tool could also be automatically selected based on the one-to-one correspondence. With the learned ResNet, engineers could use an engineering drawing to select cutting tools intelligently. Finally, the proposed approach is applied to the special-shaped machining features of a vortex shell workpiece to demonstrate its feasibility. The presented approach provides a valuable insight into the intelligent cutting tool selection for special-shaped machining features of complex products.
Keywords: Cutting tool selection | Special-shaped machining features | Complex products | Residual networks | Deep learning
مقاله انگلیسی
3 Vortex: What is the expected contribution of this novel approach to airway management?
Vortex: سهم مورد انتظار این رویکرد جدید به مدیریت راه هوایی چیست؟-2018
Airway management is an essential area in Anesthesia and anesthesiologists are considered the most expert professionals to manage airway tasks. However, complications related to inadequate airway management remain the most frequent cause of morbidity and mortality. Algorithmic strategy to solve difficulties fails due to several factors related to its structure and clinical application. The Vortex Approach emerges as a response to the limitations found in the algorithmic strategy of managing the difficult airway, using a cognitive aid strategy to reduce cognitive load and fixation error. This new strategy may represent a solution to the elusive problem of the challenging airway and reduce complications rate.
Keywords: Difficult airway ، Algorithm ، Management ، Guideline ، Vortex approach
مقاله انگلیسی
4 جریان نانوسیال و انتقال گرما در حفره با میدان مغناطیسی متغیر
سال انتشار: 2017 - تعداد صفحات فایل pdf انگلیسی: 11 - تعداد صفحات فایل doc فارسی: 16
جریان نانوسیال Fe3o4 در یک حفره با شار گرمای ثابت با استفاده از کنترل حجم بر اساس روش المان محدود بررسی و تحقیق می شود. اثرات Rayleigh و Hartmann و کسر حجمی Fe3o4 ( نانومغناطیس و اکسید آهن ) روی ویژگی های جریان و انتقال گرما تحلیل و بررسی شد. نتایج نشان می دهد که شیب دما یک عملکرد افزایشی از نیروهای شناور و کسر حجمی این ماده است ؛ اما یک عملکرد کاهشی از نیروهای لورنتس است. همچنین نرخ انتقال گرما با افزایش در نیروهای لورنتس تقویت می شود. اگرچه عکس آن در مورد نیروهای نرخ انتقال گرما با نیروهای شناوری است. علاوه براین با افزایش نیروهای لورنتس جریان اصلی به سمت پایین حرکت می کند. همچنین انتظار می رود نتایجی که اینجا ارائه می شود ، نه تنها اطلاعات مفیدی در مورد خنک کردن اجزای الکتریکی فراهم می کند بلکه مرور ادبیات حاضر را تکمیل می کند.
مقاله ترجمه شده
5 Combined experimental observation and numerical simulation of the cloud cavitation with U-type flow structures on hydrofoils
مشاهدات تجربی ترکیب شده و شبیه سازی عددی کاویتاسیون ابر با ساختارهای جریان U-نوع بر روی hydrofoils-2016
Article history:Received 29 January 2015Revised 3 October 2015Accepted 5 October 2015Available online 11 November 2015Keyword:Sheet/cloud cavitation Vortex structures Homogeneous model RANS simulations Twisted hydrofoilSheet/cloud cavitation is an important topic that is a very common type of cavitation in turbo-machinery and marine propeller. Up to now we still have limited understanding of the cavitation shedding dynamics and cloud cavity formation and development. The present study used experimental and numerical studies to gain a better understanding of the complex physics involved in this problem. A series of experimental observa- tions around hydrofoils are carried out in the cavitation tunnel of the China Ship Scientific Research Center (CSSRC) to illustrate the spatial–temporal evolution of the cloud cavity in detail. The results demonstrate that U-type flow structures are common in cloud cavities and can be divided into three stages and the closure line in a sheet cavity often has a convex–concave profile. Reentrant flows occur in the convex region with the jet direction normal to the contour edge so the shedding is mainly caused by the converging reentrant flows. Further analysis demonstrated that there was a striking difference with the cavity growth suppressed substantially in the twisted hydrofoil case if compared with straight hydrofoil and the effect of side entrant jets might make the cavity more uniform across the span. Numerical simulations were used to simulate the formation and development of the cloud cavity. The results show that the strong adverse pressure gradient in the stagnation region at the downstream end of the attached cavity forces the re-entrant flows into the vapor structure with a radially-diverging re-entrant jet and a pair of side-entrant jets, which causes the cavity shed- ding. Further analyzes of the local flow fields show that the interactions between the circulating flow and the shedding vapor cloud may be the main reason for the formation of the U-type cloud cavity structures.© 2015 Elsevier Ltd. All rights reserved.
Keyword:Sheet / cloud cavitation | Vortex structures | Homogeneous model | RANS simulations | Twisted hydrofoil
مقاله انگلیسی
6 Stochastic Equations: Theory and Applications in Acoustics, Hydrodynamics,Magnetohydrodynamics,and Radiophysics Volume 1
معادلات تصادفی: نظریه و کاربرد در صدا، هیدرودینامیک، مغناطیسی-2015
In some cases, certain coherent structures can exist in stochastic dynamic systems almost in every particular realization of random parameters describing these systems. Dynamic localization in one-dimensional dynamic systems, vortexgenesis (vortex production) in hydrodynamic flows, and phenomenon of clustering of various fields in random media (i.e., appearance of small regions with enhanced content of the field against the nearly vanishing background of this field in the remaining portion of space) are examples of such structure formation. The general methodology presented in Volume 1 is used in Volume 2 Coherent Phenomena in Stochastic Dynamic Systems to expound the theory of these phenomena in some specific fields of stochastic science, among which are hydrodynamics, magnetohydrodynamics, acoustics, optics, and radiophysics. The material of this volume includes particle and field clustering in the cases of scalar (density field) and vector (magnetic field) passive tracers in a random velocity field, dynamic localization of plane waves in layered random media, as well as monochromatic wave propagation and caustic structure formation in random media in terms of the scalar parabolic equation.
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