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Chin Pan

Bio: Chin Pan is an academic researcher from City University of Hong Kong. The author has contributed to research in topics: Boiling & Heat transfer. The author has an hindex of 29, co-authored 116 publications receiving 2395 citations. Previous affiliations of Chin Pan include University of Illinois at Urbana–Champaign & National Tsing Hua University.


Papers
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Journal ArticleDOI
TL;DR: In this article, the optimal concentration of alumina nanoparticles in doped molten Hitec that maximizes its specific heat capacity was investigated, and a simplified model of the interfacial area was developed to explain the optimal concentrations.

184 citations

Journal ArticleDOI
TL;DR: In this paper, the authors explored experimentally bubble dynamics in a single trapezoid microchannel with a hydraulic diameter of 41.3μm and found that the bubble nucleation in the microchannel may be predicted from the classical model with microsized cavities and the bubble typically grows with a constant rate from 0.13 to 7.08μm/ms.

145 citations

Journal ArticleDOI
TL;DR: In this article, the authors explored experimentally the two-phase flow instability in a microchannel heat sink with 15 parallel microchannels and found that the magnitude of pressure drop oscillations may be used as an index for the appearance of reversed flow.

117 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated and compared boiling heat transfer and two-phase flow of water in a single shallow uniform-cross-section microchannel and a diverging one with diverging angle of 0.183°.
Abstract: The present work investigates and compares boiling heat transfer and two-phase flow of water in a single shallow uniform-cross-section microchannel and a diverging one with a diverging angle of 0.183°. Both types of microchannel are with a depth of about 20 µm and a mean hydraulic diameter of about 33.3 µm. Experiments are conducted to study the effect of channel geometry on boiling heat transfer in the microchannel. It is found that the slug bubbles tend to grow exponentially in the present shallow microchannels, uniform-cross section or diverging. The results reveal that the diverging microchannel presents better performance in boiling heat transfer than that of the uniform-cross-section one, primarily due to more stable two-phase flow in the diverging microchannel. Empirical correlations based on convective boiling are developed, respectively, for both types of microchannel. For the same mass flow rate, the diverging microchannel presents a higher single-phase flow pressure drop, while the two-phase flow in both types of channel shows approximately the same pressure drop for boiling at the same heat flux.

105 citations


Cited by
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Journal ArticleDOI
TL;DR: A future outlook for the development of CNT-polymer composites as potential alternative materials for various applications, including flexible electrodes in displays, electronic paper, antistatic coatings, protective clothing, and high-performance composites for aircraft and automotive industries is given.
Abstract: Carbon nanotubes (CNTs) demonstrate remarkable electrical, thermal, and mechanical properties, which allow a number of exciting potential applications. In this article, we review the most recent progress in research on the development of CNT-polymer composites, with particular attention to their mechanical and electrical (conductive) properties. Various functionalization and fabrication approaches and their role in the preparation of CNT-polymer composites with improved mechanical and electrical properties are discussed. We tabulate the most recent values of Young's modulus and electrical conductivities for various CNT-polymer composites and compare the effectiveness of different processing techniques. Finally, we give a future outlook for the development of CNT-polymer composites as potential alternative materials for various applications, including flexible electrodes in displays, electronic paper, antistatic coatings, bullet-proof vests, protective clothing, and high-performance composites for aircraft and automotive industries.

794 citations

Journal ArticleDOI
01 Mar 2011-Carbon
TL;DR: In this paper, a remarkable synergetic effect between the multi-graphene platelets and multi-walled carbon nanotubes (MWCNTs) in improving the mechanical properties and thermal conductivity of epoxy composites is demonstrated.

791 citations

01 Aug 1953
TL;DR: In this paper, a solution for the radius of the vapor bubble as a function of time is obtained which is valid for sufficiently large radius, since the radius at which it becomes valid is near the lower limit of experimental observation.
Abstract: The growth of a vapor bubble in a superheated liquid is controlled by three factors: the inertia of the liquid, the surface tension, and the vapor pressure. As the bubble grows, evaporation takes place at the bubble boundary, and the temperature and vapor pressure in the bubble are thereby decreased. The heat inflow requirement of evaporation, however, depends on the rate of bubble growth, so that the dynamic problem is linked with a heat diffusion problem. Since the heat diffusion problem has been solved, a quantitative formulation of the dynamic problem can be given. A solution for the radius of the vapor bubble as a function of time is obtained which is valid for sufficiently large radius. This asymptotic solution covers the range of physical interest since the radius at which it becomes valid is near the lower limit of experimental observation. It shows the strong effect of heat diffusion on the rate of bubble growth. Comparison of the predicted radius‐time behavior is made with experimental observations in superheated water, and very good agreement is found.

729 citations

Journal ArticleDOI
TL;DR: In this article, the effect of finite thermal conductivity and recirculation in droplets can be taken into account using the so-called parabolic model, which is a reasonable compromise between accuracy and CPU efficiency.

724 citations

Journal ArticleDOI
Abstract: The formation of gas bubbles and their subsequent rise due to buoyancy are very important fundamental phenomena that contribute significantly to the hydrodynamics in gas−liquid reactors. The rise o...

657 citations