scholarly journals Response of underwater structures to convective component of flow noise

1980 ◽  
Vol 67 (S1) ◽  
pp. S2-S2
Author(s):  
K. L. Chandiramani
Keyword(s):  
Flow Noise ◽  
Convective Component ◽  
Underwater Structures

Response of underwater structures to convective component of flow noise

1983 ◽  
Vol 73 (3) ◽  
pp. 835-839 ◽  
Author(s):  
K. L. Chandiramani
Keyword(s):  
Flow Noise ◽  
Convective Component ◽  
Underwater Structures

Calculation of magnetic flow noise inside an enclosure in a sea-state

1998 ◽  
Author(s):  
Mark Hyman ◽  
Iskender Sahin ◽  
Thai Nguyen
Keyword(s):  
Sea State ◽  
Magnetic Flow ◽  
Flow Noise

Research on Refrigerant Flow Noise under Sudden Stop of Automobile Air Conditioning

2020 ◽  
Author(s):  
Wang Bo ◽  
Xia Deng-hui ◽  
Wang Lu ◽  
Hu Li ◽  
Yang Qi-liang ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Sudden Stop ◽  
Flow Noise ◽  
Automobile Air Conditioning

scholarly journals Enhancing Air Quality for Embedded Hospital Germicidal Lamps

2021 ◽  
Vol 13 (4) ◽  
pp. 2389
Author(s):  
Jung-Shun Chen
Keyword(s):  
Air Quality ◽  
Hospital Staff ◽  
Ventilation Rate ◽  
Hospital Environment ◽  
Design Stage ◽  
Flow Noise ◽  
Air Ventilation ◽  
Air Disinfection ◽  
Type 3

The indoor air of a hospital is always full of bacteria and viruses due to patients with different diseases. These bacteria and viruses could be highly infectious to the people in the hospital irrespective of their health conditions, and could be hazardous to the patients, their care takers, and hospital staff. Thus, keeping a good hospital air quality is very essential to the operation of the hospital. This study aims at enhancing ventilation of the interior lighting of hospitals with germicidal capabilities. Air disinfection is accomplished by adding the specially designed disinfecting filters and fans to existing embedded lamps in the hospitals. The embedded lamp has a square shape of 601 mm in width and 112 mm in thickness. In the design stage, the air flow inside the embedded lamp with the added filters and fans was investigated by numerical simulation using a computational fluid dynamics (CFD) tool. Three designs, referred to as Types 1, 2, and 3, were evaluated using steady-state CFD flow simulations. The ventilation rate of the Type 1 design was about 251.9 CMH, and 348.3 CMH for the Type 2 design by increasing the fan outlet area. However, even though the ventilation was increased by 34%, the flow field of the Type 2 design was not uniform, resulting in flows being circulated around the side locations. Thus, the Type 3 design further treats this aspect by streamlining the outlet geometry and adding flow guiding vanes to reduce flow resistance and flow unsteadiness; the corresponding air ventilation rate reached 376.3 CMH. Hence, the Type 3 design was fabricated and tested. The test results confirm that the design not only has a higher ventilation rate but also operates under a smaller pressure drop, thus accomplishing the goal of providing good air quality in the hospital environment efficiently. Moreover, the associated flow noise is reduced by about 8 dBA. Hence, both an increase in the air ventilation rate and a reduction of noise are achieved simultaneously by the present method.

scholarly journals Noise Reduction Effect of Superhydrophobic Surfaces with Streamwise Strip of Channel Flow

2021 ◽  
Vol 11 (9) ◽  
pp. 3869
Author(s):  
Chen Niu ◽  
Yongwei Liu ◽  
Dejiang Shang ◽  
Chao Zhang
Keyword(s):  
Reynolds Number ◽  
Drag Reduction ◽  
Noise Reduction ◽  
Channel Flow ◽  
Superhydrophobic Surface ◽  
Sound Field ◽  
Flow Noise ◽  
Slip Boundary ◽  
Eddy Simulation ◽  
Reduction Effect

Superhydrophobic surface is a promising technology, but the effect of superhydrophobic surface on flow noise is still unclear. Therefore, we used alternating free-slip and no-slip boundary conditions to study the flow noise of superhydrophobic channel flows with streamwise strips. The numerical calculations of the flow and the sound field have been carried out by the methods of large eddy simulation (LES) and Lighthill analogy, respectively. Under a constant pressure gradient (CPG) condition, the average Reynolds number and the friction Reynolds number are approximately set to 4200 and 180, respectively. The influence on noise of different gas fractions (GF) and strip number in a spanwise period on channel flow have been studied. Our results show that the superhydrophobic surface has noise reduction effect in some cases. Under CPG conditions, the increase in GF increases the bulk velocity and weakens the noise reduction effect. Otherwise, the increase in strip number enhances the lateral energy exchange of the superhydrophobic surface, and results in more transverse vortices and attenuates the noise reduction effect. In our results, the best noise reduction effect is obtained as 10.7 dB under the scenario of the strip number is 4 and GF is 0.5. The best drag reduction effect is 32%, and the result is obtained under the scenario of GF is 0.8 and strip number is 1. In summary, the choice of GF and the number of strips is comprehensively considered to guarantee the performance of drag reduction and noise reduction in this work.

Numerical and experimental study on spectrum and temporal coherence analyses of flow noise caused by sinusoidal vertical motion of sonobuoy

2021 ◽  
Vol 234 ◽  
pp. 109241
Author(s):  
Chunlong Huang ◽  
Qiulong Yang ◽  
Kunde Yang ◽  
Hong Liu ◽  
Yuanliang Ma
Keyword(s):  
Experimental Study ◽  
Vertical Motion ◽  
Temporal Coherence ◽  
Flow Noise

Separated flow noise of a flat plate at large attack angles

1983 ◽  
Vol 89 (3) ◽  
pp. 335-357 ◽  
Author(s):  
Y. Maruta ◽  
S. Kotake
Keyword(s):  
Flat Plate ◽  
Separated Flow ◽  
Flow Noise

Acoustic emission-based flow noise detection and mechanism analysis for gas-liquid two-phase flow

Measurement ◽  
2021 ◽  
pp. 109480
Author(s):  
Ning Zhao ◽  
Chaofan Li ◽  
Huijun Jia ◽  
Fan Wang ◽  
Zhiyue Zhao ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Mechanism Analysis ◽  
Noise Detection ◽  
Two Phase ◽  
Flow Noise

Flow noise characterization of gas–liquid two-phase flow based on acoustic emission

Measurement ◽  
2013 ◽  
Vol 46 (10) ◽  
pp. 3887-3897 ◽  
Author(s):  
Lide Fang ◽  
Yujiao liang ◽  
Qinghua Lu ◽  
Xiaoting Li ◽  
Ran Liu ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Noise ◽  
Noise Characterization
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