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Chaofa Hu

Bio: Chaofa Hu is an academic researcher from Beijing Jiaotong University. The author has contributed to research in topics: Turbine & Triboelectric effect. The author has an hindex of 1, co-authored 1 publications receiving 21 citations.

Papers
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TL;DR: In this paper, a flat plate pulsating heat pipe was established and experimental research was carried out in this system to know the mechanism of heat transfer, start-up and operating characteristics.
Abstract: An experimental system of flat plate pulsating heat pipe was established and experimental research was carried out in this system to know the mechanism of heat transfer, start-up and operating characteristics. The factors, such as filling rate, heating power, heating method etc, which have great influence on the thermal performance of the plate pulsating heat pipe were discussed. The results indicate that heating power and filling rate are the important factors for the start-up of the plate pulsating heat pipe. The different start-up power is needed with different filling rate, and the start-up of the heat pipe in case of bottom heated is much easier than that of top heated. Increasing the heating power and enlarging the heating area can make the start-up easier. Heating power can also affect the start-up time of heat pipe under the condition of bottom heated, while it does not have some influence to the heat pipe of top heated. The thermal resistance of plate pulsating heat pipe is related with the heating power, and the higher the heating power is, the smaller the thermal resistance is. But the best filling rate which the heat pipe needs is different with different heating methods, and the performance of the heat pipe in the case of bottom heated is better than the others.

27 citations

Journal ArticleDOI
TL;DR: In this paper , the authors used the Taguchi method to optimize the typical parameters of the vertical axis turbine, i.e., airfoil (NACA), pitch angle (β), enwinding ratio (ϖ), solidity ratio (σ), and small shaft position (O).

6 citations

Journal ArticleDOI
TL;DR: In this article , a high output triboelectric-electromagnetic hybrid generator based on in-phase parallel connection (IP•HG) is proposed, which combines the output characteristics of both TENG and EMG to provide excellent output over a wide range of operating frequencies.
Abstract: With the advent of carbon neutrality, renewable energy installations are being upgraded toward miniaturization, low cost, and high conversion efficiency. Thus, a high output triboelectric–electromagnetic hybrid generator based on in‐phase parallel connection (IP‐HG) is proposed. The output characteristics of both TENG (triboelectric nanogenerator) and EMG (electromagnetic generator) can be effectively complemented to provide excellent output over a wide range of operating frequencies. By connecting multiple TENGs in parallel with EMGs in the same phase respectively, cumbersome rectification elements and wiring can be eliminated, and the energy output of the device can be greatly increased. The output characteristics and advantages of the IP‐HG are systematically investigated, including the material of the TENG, the rotation speed, the combination of dielectrode, and their effect on the electrical output of the IP‐HG. The short‐circuit current of 63 mA, open‐circuit voltage of 80 V, and an instantaneous output power density of 610 W m−3 is obtained by using a full‐wave rectifier circuit at 243 rpm, which can charge a 470 μF capacitor to 1 V in 0.2 s. A maximum output efficiency reaches 36.162% at 189 rpm. In addition, the IP‐HG can continuously power a commercial sensor and three 5 W DC light bulbs at very low rotational speeds. The reported IP‐HG offers an efficient and sustainable design approach to the development of hybrid harvesters.

4 citations


Cited by
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Journal ArticleDOI
Xiaohong Han1, Xuehui Wang1, Zheng Haoce1, Xiangguo Xu1, Guangming Chen1 
TL;DR: In this article, the authors reviewed the development of pulsating heat pipe (PHP) on the basis of systematic summary of the latest results of both experimental and theoretical studies, and some promising and innovatory applications of the PHP are also reported.
Abstract: The expectation of sustainable development of energy and environment has widely attracted public׳s attention, and the high-efficiency heat transfer device is greatly needed. As a new heat transfer device, pulsating heat pipe (PHP) has been considered have a bright prospect due to its obvious advantages – simple structure, low cost and excellent heat transfer capability. A number of experimental and theoretical researches have been conducted on PHP in the past decades since it was proposed by Akachi in 1990. However, due to the hydrodynamic and thermodynamic coupling effect, the operational mechanism of PHP is extremely complex and has not been completely revealed so far. With great expectation of applications for the PHP in the near future, this paper attempts to review the development of PHP on the basis of systematic summary of the latest results of both experimental and theoretical studies. Meanwhile, some promising and innovatory applications of the PHP are also reported. This paper is expected to provide basic reference for future researches.

200 citations

Journal ArticleDOI
TL;DR: In this article, a single-turn pulsating heat pipe (PHP) is applied for PV cooling and a copper fin with the same dimensions as the PHP for cooling the PV panel is simulated to compare the performance of the PHP with a solid metal like copper.

120 citations

Journal ArticleDOI
TL;DR: In this article, a pulsating heat pipe (PHP) was designed and tested under conditions to simulate heat dissipation requirements of a proton exchange membrane (PEM) fuel cell stack.

107 citations

Journal ArticleDOI
TL;DR: In this article, the effects of liquid filling ratios and leakage on the cooling performance of flat plate heat pipes (FPHPs) were examined experimentally in a study with the size of 150mm-×-50mm-2.5mm for all Al 6061 FPHPs filled with acetone.

66 citations