scholarly journals Mechanical characteristics and pore evolution of red sandstone under ultrasonic high-frequency vibration excitation

AIP Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 055202
Author(s):  
Lei Zhang ◽  
Xufeng Wang ◽  
Jiyao Wang ◽  
Zhanbiao Yang
Keyword(s):  
High Frequency ◽  
Mechanical Characteristics ◽  
High Frequency Vibration ◽  
Red Sandstone ◽  
Vibration Excitation ◽  
Pore Evolution

Heat Transfer Augmentation in Heat Exchanger by using Nanofluids and Vibration Excitation - A Review

2020 ◽  
Vol 17 (1) ◽  
pp. 7719-7733
Author(s):  
N. F. D. Razak ◽  
M. S. M. Sani ◽  
W. H. Azmi
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
High Frequency ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
High Frequency Vibration ◽  
Heat Transfer Augmentation ◽  
Vibration Excitation ◽  
Efficient Heat Transfer ◽  
Fouling Reduction

Nanofluids are used in heat exchanger system as efficient heat transfer fluids to improve heat transfer performance by passive method. Besides, another special active technique by implementing the low or high frequency vibration, which was used in heat exchanger to enhance the heat transfer performance. This paper reviews the heat transfer augmentation in heat exchanger by using nanofluids, vibration excitation of low and high frequency vibration. The use of nanofluids in heat exchanger system can provide better effective thermal conductivity compared to the conventional coolants. The presence of nanosize particles in nanofluids performed better mixing flow with higher thermal properties compared to pure fluids. Additionally, the active method by inducing low and high frequency vibration technology was applied in heat exchanger system. The heat transfer augmentation by vibration excitation was resulted from the mitigation of the fouling resistance on the surface of the tube wall. It was found that vibration excitation not only increase the heat transfer rate, but also might be a solution for fouling reduction. Hence, there is a great potential of using nanofluids together with vibration excitation simultaneously in heat exchanger system to improve the heat transfer performance.

Tool wear analysis in high-frequency vibration-assisted drilling of additive manufactured Ti6Al4V alloy

Wear ◽  
2021 ◽  
pp. 203814
Author(s):  
Marco Sorgato ◽  
Rachele Bertolini ◽  
Andrea Ghiotti ◽  
Stefania Bruschi
Keyword(s):  
Tool Wear ◽  
High Frequency ◽  
Ti6al4v Alloy ◽  
High Frequency Vibration ◽  
Wear Analysis

scholarly journals Microscale Capillary Wave Turbulence Excited by High Frequency Vibration

Langmuir ◽  
2013 ◽  
Vol 29 (11) ◽  
pp. 3835-3845 ◽  
Author(s):  
Jeremy Blamey ◽  
Leslie Y. Yeo ◽  
James R. Friend
Keyword(s):  
High Frequency ◽  
Capillary Wave ◽  
Wave Turbulence ◽  
High Frequency Vibration

High-Frequency Vibration Response of Metal Honeycomb Sandwich Structure

2009 ◽  
Vol 79-82 ◽  
pp. 1727-1730 ◽  
Author(s):  
Xiao Dong He ◽  
Xiang Hao Kong ◽  
Li Ping Shi ◽  
Ming Wei Li
Keyword(s):  
High Frequency ◽  
Sandwich Structure ◽  
Dynamic Pressure ◽  
Vibration Response ◽  
Element Analysis ◽  
High Frequency Vibration ◽  
Honeycomb Sandwich ◽  
Vibration Experiment ◽  
Aerial Vehicle ◽  
Honeycomb Sandwich Structure

ARMOR TPS panel is above the whole ARMOR TPS, and the metal honeycomb sandwich structure is the surface of the ARMOR TPS panel. So the metal honeycomb sandwich structure plays an important role in the ARMOR TPS, while it bears the flight dynamic pressure and stands against the flight dynamic calefaction. So the active environment of metal honeycomb sandwich structure is very formidable. We have to discuss any extreme situation, for reason of making sure aerial vehicle is safe. And high-frequency vibration is one of active environment. In this paper we have analyzed high-frequency vibration response of metal honeycomb sandwich structure. We processed high-frequency vibration experiment by simulating true aerial environment. Sequentially we operated high-frequency vibration experiment of metal honeycomb sandwich structure with cracks, notches and holes. Then finite-element analysis was performed by way of validating the experiment results. Haynes214 is a good high temperature alloy material of both face sheet and core at present, so we choose it in this paper.

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