Ultralow-frequency tunable acoustic metamaterials through tuning gauge pressure and gas temperature

Extreme Mechanics Letters ◽

10.1016/j.eml.2021.101218 ◽

2021 ◽

Vol 44 ◽

pp. 101218

Author(s):

Shaowu Ning ◽

Ziming Yan ◽

Dongyang Chu ◽

Heng Jiang ◽

Zhanli Liu ◽

...

Keyword(s):

Acoustic Metamaterials ◽

Gas Temperature ◽

Ultralow Frequency ◽

Gauge Pressure ◽

Frequency Tunable

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Low-frequency tunable locally resonant band gaps in acoustic metamaterials through large deformation

Extreme Mechanics Letters ◽

10.1016/j.eml.2019.100623 ◽

2020 ◽

Vol 35 ◽

pp. 100623 ◽

Cited By ~ 5

Author(s):

Shaowu Ning ◽

Fengyuan Yang ◽

Chengcheng Luo ◽

Zhanli Liu ◽

Zhuo Zhuang

Keyword(s):

Large Deformation ◽

Low Frequency ◽

Band Gaps ◽

Acoustic Metamaterials ◽

Frequency Tunable

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Acoustic metamaterials: Silence all around

Nature China ◽

10.1038/nchina.2007.238 ◽

2007 ◽

Author(s):

Felix Cheung

Keyword(s):

Acoustic Metamaterials

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Recovering waste energy of the combined gas turbine system using paraffin melting

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.14.4.2020.15.0589 ◽

2020 ◽

Vol 14 (4) ◽

pp. 7481-7497

Author(s):

Yousef Najjar ◽

Abdelrahman Irbai

Keyword(s):

Melting Process ◽

Payback Period ◽

Energy Utilization ◽

Raw Material ◽

Heat Transfer Fluid ◽

Layered System ◽

Exhaust Gas ◽

Gas Temperature ◽

Power Cycle ◽

Waste Energy

This work covers waste energy utilization of the combined power cycle by using it in the candle raw material (paraffin) melting process and an economic study for this process. After a partial utilization of the burned fuel energy in a real bottoming steam power generation, the exhaust gas contains 0.033 of the initially burned energy. This tail energy with about 128 ºC is partly driven in the heat exchanger of the paraffin melting system. Ansys-Fluent Software was used to study the paraffin wax melting process by using a layered system that utilizes an increased interface area between the heat transfer fluid (HTF) and the phase change material (PCM) to improve the paraffin melting process. The results indicate that using 47.35 kg/s, which is 5% of the entire exhaust gas (881.33 kg/s) from the exit of the combined power cycle, would be enough for producing 1100 tons per month, which corresponds to the production quantity by real candle's factories. Also, 63% of the LPG cost will be saved, and the payback period of the melting system is 2.4 years. Moreover, as the exhaust gas temperature increases, the consumed power and the payback period will decrease.

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