scholarly journals Thermal Cooling Enhancements in a Heated Channel Using Flow-Induced Motion

2021 ◽  
pp. 1-39
Author(s):  
Mayank Verma ◽  
Ashoke De
Keyword(s):  
Cross Sections ◽  
Plate Motion ◽  
Flexible Plate ◽  
Power Requirement ◽  
Partitioned Approach ◽  
Heated Channel ◽  
Induced Motion ◽  
Convection Problem ◽  
The Comparative Study ◽  
Thermal Cooling

Abstract The paper presents the comparative study of the vortex-induced cooling of a heated channel for the four different cross-sections of the rigid cylinder, i.e., circular, square, semi-circular, and triangular, with or without the rigid/flexible splitter plate at the Reynolds number (based on the hydraulic diameter) of 200. The study presents a comprehensive analysis of the flow and thermal performance for all the cases. For flexible plate cases, a partitioned approach is invoked to solve the coupled fluid-structure-convection problem. The simulations show the reduction in the thermal boundary layer thickness at the locations of the vortices resulting in the improved Nusselt number. Further, the thin plate's flow-induced motion significantly increases the vorticity field inside the channel, resulting in improved mixing and cooling. It is observed that the plate-motion amplitude is maximum when the plate is attached to the cylinder with the triangular cross-section. The power requirement analysis shows that the flexible plate reduces the power required to pump the channel's cold fluid. Thus, based on the observations of the present study, the authors recommend using the flexible plate attached to the cylinder for improved convective cooling.

On the Vibration Damping of a Plate by Means of a Viscous Fluid Layer

1987 ◽  
Vol 109 (2) ◽  
pp. 178-184 ◽  
Author(s):  
K. Uno Ingard ◽  
Adnan Akay
Keyword(s):  
Viscous Fluid ◽  
Frequency Response ◽  
Flow Resistance ◽  
Acoustic Radiation ◽  
Fluid Layer ◽  
Vibration Damping ◽  
Plate Motion ◽  
Flexible Plate ◽  
Dependent Flow ◽  
Rigid Plane

Vibration damping of a plate by means of a fluid layer is investigated. First, the frequency-dependent flow resistance of a fluid layer is explained with a simple illustration of the damping mechanism. Then, the vibration response of a plate is examined when it is backed by a rigid plane or another flexible plate with a fluid layer constricted in-between. Effects of the plate motion and acoustic radiation on the damping mechanism are also considered. The numerical results are presented in terms of frequency response of the plates.

scholarly journals Wave Interaction and Overwash with a Flexible Plate by Smoothed Particle Hydrodynamics

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3354 ◽  
Author(s):  
Thien Tran-Duc ◽  
Michael H. Meylan ◽  
Ngamta Thamwattana ◽  
Bishnu P. Lamichhane
Keyword(s):  
Elastic Plate ◽  
Smoothed Particle Hydrodynamics ◽  
Fluid Motion ◽  
Wave Interaction ◽  
Fluid Flows ◽  
Plate Motion ◽  
Flexible Plate ◽  
Mesh Free ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

The motion of a flexible elastic plate under wave action is simulated, and the well–known phenomena of overwash is investigated. The fluid motion is modelled by smoothed particle hydrodynamics, a mesh-free solution method which, while computationally demanding, is flexible and able to simulate complex fluid flows. The freely floating plate is modelled using linear thin plate elasticity plus the nonlinear rigid body motions. This assumption limits the elastic plate motion to be small but is valid for many cases both in geophysics and in the laboratory. The principal conclusion is that the inclusion of flexural motion causes significantly less overwash than that which occurs for a rigid plate.

Flow induced motion and energy harvesting of bluff bodies with different cross sections

2015 ◽  
Vol 91 ◽  
pp. 416-426 ◽  
Author(s):  
Lin Ding ◽  
Li Zhang ◽  
Chunmei Wu ◽  
Xinru Mao ◽  
Deyi Jiang
Keyword(s):  
Energy Harvesting ◽  
Cross Sections ◽  
Bluff Bodies ◽  
Induced Motion

scholarly journals Monocotyledonous vascular bundles characterized by image analysis and pattern recognition

2018 ◽  
Author(s):  
Juliana Virginio da Silva ◽  
Cesar Comin ◽  
Luciano da Fontoura Costa
Keyword(s):  
Pattern Recognition ◽  
Image Analysis ◽  
Comparative Study ◽  
Spatial Scale ◽  
Species Identification ◽  
Cross Sections ◽  
Plant Science ◽  
Equivalent Diameter ◽  
Vascular Bundles ◽  
The Comparative Study

Recent advances in image analysis and pattern recognition have paved the way to several developments in plant science. In the present work, we report the comparative study, by using the aforementioned approaches, of vascular bundles of Dracaena marginata. More specifically, we used 33 measurements related to shape, density and regularity of imaged cross-sections of the stem. By using individual, pairwise and PCA projections of the adopted measurements, we were able to find the combinations of measurements leading to the best separation between the considered tissues. In particular, the best separation was obtained for entropy taken at a particular spatial scale combined with the equivalent diameter. The reported developments open several perspectives for applications in content-based retrieval, diagnosis, and species identification.

scholarly journals Analysis of Flexible Plate Motion Based on Co-Simulation of STAR-CCM + and ABAQUS

2021 ◽  
Vol 2029 (1) ◽  
pp. 012153
Author(s):  
Linzhao Shu ◽  
Guang Yang ◽  
Nan Ji ◽  
Zhipeng Qian
Keyword(s):  
Plate Motion ◽  
Flexible Plate

scholarly journals Analysis on Flow Induced Motion of Cylinders with Different Cross Sections and the Potential Capacity of Energy Transference from the Flow

2017 ◽  
Vol 2017 ◽  
pp. 1-19 ◽  
Author(s):  
Jijian Lian ◽  
Xiang Yan ◽  
Fang Liu ◽  
Jun Zhang
Keyword(s):  
Circular Cylinder ◽  
Cross Sections ◽  
Amplitude Ratio ◽  
Maximum Amplitude ◽  
Circular Cylinders ◽  
Amplitude Variation ◽  
Transfer Ratio ◽  
Potential Capacity ◽  
Induced Motion ◽  
Limited Motion

The energy in flow induced motion (FIM) was harnessed in recent years. In this study, the energy transfer ratio was derived to estimate the energy transference from the flow to the FIM. Then the FIM characteristics and energy transference of cylinders with different cross sections were experimentally investigated. The main findings are listed as follows. (a) Circular cylinders and diamond prisms both present a self-limited motion. The maximum amplitude ratio of circular cylinder is around 1~1.2 which is higher than that of diamond prism (0.4~0.5). (b) Triangle prisms and right square prisms present a self-unlimited motion. For triangle prism, amplitude ratio increases over 1.8; for right square prisms, amplitude ratio reaches 1.2. (c) The maximum transfer ratios of circular cylinder and triangle prism are 80% and 57%, respectively, which are much higher than those of other prisms, indicating that circular cylinder and triangle prism have better performances in energy transference. (d) The transfer ratio is strongly dependent on the damping and mass; higher damping or mass will promote a higher transfer ratio. (e) Beyond the critical transfer ratios, amplitude variation coefficients are around 10%~30% resulting in a better performance in stationarity.

Large-Amplitude Oscillations of a Finite-Thickness Cantilevered Flexible Plate in Viscous Channel Flow

2010 ◽  
Author(s):  
Novak S. J. Elliott ◽  
Anthony D. Lucey ◽  
Matthias Heil
Keyword(s):  
Soft Palate ◽  
Solid Mechanics ◽  
Structural Model ◽  
Finite Thickness ◽  
Plane Channel ◽  
Finite Amplitude ◽  
Plate Motion ◽  
Flexible Plate ◽  
Single Plane ◽  
Analogue System

The broad aim of the present work is to elucidate mechanisms of obstructive breathing disorders (snoring, sleep apnea) in which flow-induced instabilities of the soft palate feature. We use the well-established analogue system model wherein a two-dimensional flexible plate (soft palate) is mounted downstream of a rigid surface that separates upper and lower plane channel (oral and nasal tracts) flows that interact with the plate motion and then combine into a single plane channel (pharynx) flow. For this system, we take the next step towards biomechanical realism by modeling finite-amplitude motions of the flexible plate and incorporating finite thickness in its structure. The structural model makes use of a geometrically nonlinear formulation of the solid mechanics. Viscous flow is modeled at Reynolds numbers giving unsteady laminar flow. The fully-coupled fluid-structure interaction (FSI) model is developed using the open-source finite-element library oomph–lib. We first show the effects of finite amplitude and finite thickness on the in-vacuo modes of the plate through a validation study of the structural mechanics. Thereafter, we use the FSI model to illustrate both stable and unstable motions of the plate. Overall, this paper demonstrates the versatility of the new modeling approach and its suitability for characterizing the dependence of the plate’s stability on the system parameters.

scholarly journals Implementation of High Speed Vedic Multiplier Using Vertical and Crosswise Algorithm

2018 ◽  
Vol 6 (1) ◽  
pp. 36
Author(s):  
G. Vadiraj ◽  
K. Shivanand ◽  
B. Sampat ◽  
G. Subramanya Nayak
Keyword(s):  
High Speed ◽  
Digital Signal ◽  
Inner Product ◽  
Time Signal ◽  
Arithmetic Operations ◽  
Fundamental Function ◽  
Power Requirement ◽  
Vedic Multiplier ◽  
The Comparative Study ◽  
Dsp Applications

Multiplication is an important fundamental function in arithmetic operations. Multiplication-based operations such as Multiply and Accumulate (MAC) and inner product are some of the frequently used operations in many Digital Signal Processing (DSP) applications such as convolution, Fast Fourier Transform(FFT), filtering and in microprocessors in its arithmetic and logic unit. Since multiplication dominates the execution time of most DSP algorithms, so there is a need of high speed multiplier. Higher throughput arithmetic operations are important to achieve the desired performance in many real-time signal and image processing applications. In this project, the comparative study of Vedic multiplier and Sequential multiplier is done for low power requirement and high speed. The proposed architecture is based on the Vertical and Crosswise algorithm of ancient Indian Vedic Mathematics, which increases the speed of multiplier by reducing the number of clock cycles thus achieving the greater speed of the processor or system.

Investigation of nano-inks’ behaviour on flexible and rigid substrates under various conditions

Circuit World ◽  
2017 ◽  
Vol 43 (1) ◽  
pp. 2-8 ◽  
Author(s):  
Peter Lukacs ◽  
Alena Pietrikova ◽  
Beata Ballokova ◽  
Dagmar Jakubeczyova ◽  
Ondrej Kovac
Keyword(s):  
Cross Sections ◽  
Design Methodology ◽  
Test Pattern ◽  
Deposition Process ◽  
Content Type ◽  
Inkjet Printing Technology ◽  
Coffee Ring Effect ◽  
Polymeric Substrates ◽  
The Comparative Study ◽  
Substrate Temperatures

Purpose This paper aims to find the optimal deposition conditions for achieving the homogenous structure of the silver layers onto three types of polymeric substrates as well as on the rigid substrates. For this reason, the detailed investigation of the silver-based layers deposited at different technological conditions by microscopic methods is presented in this paper. Design/methodology/approach The special test pattern has been designed and deposited at different substrate temperatures by using two types of generally available silver-based nano-inks. Cross-sections and 3D profiles of the deposited silver layers have been profoundly analysed by using the optical profiler Sensofar S Neox on the generally used polymeric (PI, PET and PEN) and rigid substrates (951 and 9K7 LTCC, glass and alumina). Findings The results prove the strong correlation between the substrate temperature during the deposition process and the final shape of the created structure which has the a direct impact on the layers’ homogeneity. The results also prove the theory of the coffee ring effect creation in the inkjet printing technology. Originality/value The main benefit of this paper lies in the possibility of the homogeneity achievement of the deposited silver-based layers on the several polymeric and rigid substrates by managing the temperature during the deposition. The paper also offers the comparative study of nano-inks’ behaviour on several polymeric and rigid substrates.

Dynamics of fluid flow over a circular flexible plate

2014 ◽  
Vol 759 ◽  
pp. 56-72 ◽  
Author(s):  
Ru-Nan Hua ◽  
Luoding Zhu ◽  
Xi-Yun Lu
Keyword(s):  
Fluid Flow ◽  
Plate Motion ◽  
Immersed Boundary ◽  
Flexible Plate ◽  
Fluid Structure ◽  
Structure System ◽  
Elastic Potential Energy ◽  
Boltzmann Method ◽  
Deformation Patterns ◽  
Deformation Modes

AbstractThe dynamics of viscous fluid flow over a circular flexible plate are studied numerically by an immersed boundary–lattice Boltzmann method for the fluid flow and a finite-element method for the plate motion. When the plate is clamped at its centre and placed in a uniform flow, it deforms by the flow-induced forces exerted on its surface. A series of distinct deformation modes of the plate are found in terms of the azimuthal fold number from axial symmetry to multifold deformation patterns. The developing process of deformation modes is analysed and both steady and unsteady states of the fluid–structure system are identified. The drag reduction due to the plate deformation and the elastic potential energy of the flexible plate are investigated. Theoretical analysis is performed to elucidate the deformation characteristics. The results obtained in this study provide physical insight into the understanding of the mechanisms on the dynamics of the fluid–structure system.

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