Article
Thermodynamics
X. L. Zhong, K. C. Chan, S. C. Fu, L. Q. Wang, Christopher Y. H. Chao
Summary: Piezoelectric fan cooling is receiving increased attention for its compact size and high energy efficiency. This study investigates the impact of fan location and channel configuration on heat transfer performance. By adjusting the fan position, a higher streamwise velocity is achieved, leading to improved heat transfer. Inserting a fan into the channel results in a 55% enhancement of the Nusselt number compared to natural convection. Additionally, both expansion and contraction configurations enhance heat transfer, with the optimal configuration providing an additional 10% enhancement. Flow visualization and velocity measurements reveal that the contraction configuration boosts streamwise velocity and generates a jet flow pattern, while the expansion configuration promotes more vortices and spanwise mixing.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Electrical & Electronic
Jun Huang, Xingang Cong, Jianhui Zhang, Kai Li, Jiaming Liu, Quan Zhang
Summary: In this paper, a new type of piezoelectric heat exchanger was proposed and its performance was tested and analyzed. The results showed that the piezoelectric heat exchanger was able to effectively control the temperature of the CPU under extreme thermal load and had better heat exchange effect. This heat exchanger could play an important role in the field of heat exchange for electronic devices.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Mechanics
Jaeik Ko, Myong Hun Oh, Minsuk Choi
Summary: The experiment and simulation results confirm that the piezoelectric fan is effective in cooling the heated plate, especially at the center of the plate. The local convective heat transfer coefficient is closely related to the movement of vortices generated by the fan, affecting the cooling efficiency of the fan.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2021)
Article
Environmental Sciences
Nathan B. Morris, Georgia K. Chaseling, Timothy English, Fabian Gruss, Mohammad Fauzan Bin Maideen, Anthony Capon, Ollie Jay
Summary: The study found that, particularly for healthy young adults, the use of electric fans did not worsen heat stress on the majority of days between 2007 and 2019.
LANCET PLANETARY HEALTH
(2021)
Article
Materials Science, Multidisciplinary
Yanwei Zhao, Dan Pang, Meijie Chen, Zhuo Chen, Hongjie Yan
Summary: Passive daytime radiative cooling(PDRC) is an electricity-free cooling technology with environmental benefits, and a new scalable aqueous-based processing method utilizing hollow dielectric microspheres can create dielectric PDRC coatings with broadband emittance spectra for outdoor devices heat dissipation. This method does not require harmful organic solvents, and the resulting coatings have great stability, water repellence, and excellent flexibility.
APPLIED MATERIALS TODAY
(2022)
Article
Engineering, Mechanical
Fei Chen, Xiao Wang, Haopeng Li, Aimin Li, Yongrui Deng, Zuzhi Tian, Xiangfan Wu
Summary: A novel water-cooling structure is proposed in this paper to address the negative effect of centrifugal force on heat dissipation. The magnetic field is investigated by finite element calculation, and experimental results show that the device has excellent heat dissipation effect.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
Rui Wang, Jiyu Qian, Tao Wei, Haojie Huang
Summary: With the innovation of high power and high integration for chips in microwave devices, research on high-efficiency integrated cooling systems is advancing. The proposed integrated closed cooling system overcomes the disadvantages of current cooling architecture, achieving high efficiency and reliability for cooling high-power chips.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Physiology
Hidenori Otani, Makoto Fukuda, Takehiro Tagawa
Summary: This study suggests that using a fan cooling jacket to cool down between exercise bouts and post-exercise can effectively alleviate thermal strain and discomfort during and after exercise in hot-humid environments.
FRONTIERS IN PHYSIOLOGY
(2021)
Article
Thermodynamics
Xin-Jun Li, Xiao-Ming Tan, Jing-Zhou Zhang, Bin-Bin Wu, Wei-Wei Chen
Summary: A numerical investigation was conducted to explore the thermal-fluid characteristics of corrugated surfaces cooled by a vibrating piezoelectric fan. The study found that the geometric shape of the corrugated surfaces primarily determines the distribution of the time-averaged Nusselt number, with the minimum and maximum values typically occurring at the trough and peak, respectively. Compared to a flat surface, the corrugated surfaces are more prone to velocity boundary layer separation, and the size of the corrugation directly affects the scale of the counter-rotating vortices. Among all the corrugated surfaces studied, the one with the smallest amplitude and the largest period demonstrated the best performance.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Green & Sustainable Science & Technology
Faraz Afshari, Emre Mandev, Fatih Yildiz, Fatih Yildiz
Summary: This study analyzes the influence of the base thickness of the external heat exchanger on the cooling performance of air-to-air thermoelectric cooling systems, and evaluates it through experimental and numerical methods. The experimental results show that reducing the thickness from 4.5mm to 1.5mm led to a 14% difference in temperature in the cooling chamber under different working conditions. The numerical simulation reveals the airflow structure and temperature distribution inside and outside the refrigerator.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Electrical & Electronic
Renhui Hu, Lipeng He, Chensheng Wang, Hongxin Wang, Lei Sun, Xiaotao Li, Jieqiong Lin
Summary: This paper proposes a valveless piezoelectric pump composed of a diffuser/nozzle combined with a Laval flow tube to address the issue of low cooling efficiency caused by low spray cooling flow and impact force. The Laval tube increases flow rate and accelerates the fluid, thereby enhancing impact force and improving heat transfer efficiency. The study establishes the dynamic system equations for the pump and investigates the influence of Laval tube parameters (L, D, d) on output performance. Simulations analyze fluid flow velocity and turbulent energy loss characteristics in the Laval tube, while experiments confirm the best flow rate at 71.4 ml/min with L=4 mm, D=10 mm, and d=6 mm (220 V, 60 Hz). The results demonstrate that this external Laval tube piezoelectric pump can enhance the flow rate of spray heat dissipation, with potential applications in the field of heat dissipation.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Thermodynamics
Zheng-sheng Li, Jing Wang, Rong-jie Cai, Jun Wang
Summary: A solid-state fan (SSF) using copper foam as a collecting electrode was developed for heat dissipation of electronic devices. The discharge characteristics and heat dissipation performance were evaluated and compared, leading to the optimization of the SSF structure. It was found that the 'needle-to-copper foam' SSF had better cooling performance at high applied voltage compared to the 'needle-to-mesh' SSF.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Ding Zhao, Zhiguo Lei, Chao An
Summary: In this study, a liquid cooling plate (LCP) with a honeycomb structure (HLCP) was designed to increase the heat exchange area of the cooling channels and improve the heat dissipation performance. The optimal structural parameters and the effect of different coolant flow velocities were investigated. The results showed that beyond a certain inlet velocity, the improvement in cooling performance was not significant.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Junjie Shan, Sha Wang, Fan Zhou, Jingyi Hu, Qingqing Liu, Shuyu Lin, Yanfeng Zhang, Zhongfan Liu
Summary: This study achieved the first synthesis of a novel multi-D graphene/AlN ceramic hybrid, significantly reducing the temperature rise caused by self-heating in the new generation of CPETs. Additionally, the electroacoustic energy conversion efficiency was dramatically improved, promoting new applications in the fields of new-generation energy conversion and thermal management.
ADVANCED MATERIALS
(2021)
Article
Construction & Building Technology
Khushbu Mankani, Hassam Nasarullah Chaudhry, John Kaiser Calautit
Summary: This study analyzes the cooling performance of air-cooled heat sinks for the climate of Dubai, UAE, and improves the feasibility of photovoltaic technology by optimizing the temperature of solar panels.
ENERGY AND BUILDINGS
(2022)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)