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Kirk Tien

Bio: Kirk Tien is an academic researcher from Nuclear Regulatory Commission. The author has contributed to research in topics: Two-phase flow & Leidenfrost effect. The author has an hindex of 11, co-authored 36 publications receiving 342 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the effects of pipe size on horizontal air-water two-phase flow in a wide range of flow configurations were investigated. But the results were not reflected on the flow regime maps employed in the nuclear reactor system analysis codes.

45 citations

Journal ArticleDOI
TL;DR: In this article, the authors implemented the one-dimensional interfacial area transport equation into the TRACE code, being developed by the U.S. Nuclear Regulatory Commission (NRC).

30 citations

Journal ArticleDOI
TL;DR: In this article, the geometric effects of a 90-degree vertical-upward elbow on local two-phase flow-parameters in an air-water system, and develops an experimental database for interfacial area transport modeling.

29 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigate horizontal bubbly-to-plug and bubblyto-slug transition flows and study the two-phase flow structures and transition mechanisms in these transition flows.

28 citations

Journal ArticleDOI
TL;DR: In this article, a reliable experimental database for the two-phase pressure drop and void fraction is established with a differential pressure transducer and a four-sensor conductivity probe, respectively.

27 citations


Cited by
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Book
01 Jan 1994
TL;DR: In this paper, recent developments in three dimensional and unsteady turbulence boundary layer computations are discussed, including the physics of convention solidification interaction, the continental shelf bottom boundary layer, gravity currents in rotating systems, eddies, waves, circulation, and mixing.
Abstract: This book covers the following topics: recent developments in three dimensional and unsteady turbulence boundary-layer computations; flows far from equilibrium via molecular dynamics; physics of convention-solidification interaction; the continental shelf bottom boundary layer; gravity currents in rotating systems; strange attractors in fluids: another view; eddies, waves, circulation, and mixing: statistical geofluid mechanics; regular and mach reflection of shock waves; ship propellers; coherent structures; the critical layer and stability; general circulation of the oceans; characteristic-based schemes for the euler equations; vortex flows in aerodynamics; steady and unsteady boundary-layer separation; and wind wave prediction.

183 citations

Journal ArticleDOI
TL;DR: A systematic review on nanofluids of carbon-base, precisely; carbon nanotubes, graphene, and nanodiamonds, and their employment in thermal systems commonly used in the energy sectors and the current gap in scientific knowledge is provided to set up future research directions.
Abstract: Nanofluids have opened the doors towards the enhancement of many of today’s existing thermal applications performance. This is because these advanced working fluids exhibit exceptional thermophysical properties, and thus making them excellent candidates for replacing conventional working fluids. On the other hand, nanomaterials of carbon-base were proven throughout the literature to have the highest thermal conductivity among all other types of nanoscaled materials. Therefore, when these materials are homogeneously dispersed in a base fluid, the resulting suspension will theoretically attain orders of magnitude higher effective thermal conductivity than its counterpart. Despite this fact, there are still some challenges that are associated with these types of fluids. The main obstacle is the dispersion stability of the nanomaterials, which can lead the attractive properties of the nanofluid to degrade with time, up to the point where they lose their effectiveness. For such reason, this work has been devoted towards providing a systematic review on nanofluids of carbon-base, precisely; carbon nanotubes, graphene, and nanodiamonds, and their employment in thermal systems commonly used in the energy sectors. Firstly, this work reviews the synthesis approaches of the carbon-based feedstock. Then, it explains the different nanofluids fabrication methods. The dispersion stability is also discussed in terms of measuring techniques, enhancement methods, and its effect on the suspension thermophysical properties. The study summarizes the development in the correlations used to predict the thermophysical properties of the dispersion. Furthermore, it assesses the influence of these advanced working fluids on parabolic trough solar collectors, nuclear reactor systems, and air conditioning and refrigeration systems. Lastly, the current gap in scientific knowledge is provided to set up future research directions.

49 citations

Journal ArticleDOI
TL;DR: In this article, the effects of pipe size on horizontal air-water two-phase flow in a wide range of flow configurations were investigated. But the results were not reflected on the flow regime maps employed in the nuclear reactor system analysis codes.

45 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of grinding parameters (such as workpiece infeed speed, depth of cut, and abrasive wheel speed) on workpiece surface roughness were analyzed.
Abstract: The grindability and sensibility analysis of surface roughness of powder metallurgy nickel-base superalloy FGH96 were studied in comparison to the wrought nickel-base superalloy GH4169. The effects of grinding parameters (such as workpiece infeed speed, depth of cut, and abrasive wheel speed) on grinding force, grinding temperature, specific grinding energy, abrasive wheel wear, and surface roughness were analyzed. The results show that the grinding force, grinding temperature, and specific grinding energy of GH4169 are usually higher than those of FGH96 under the given experimental conditions. However, the wear behavior of the brown corundum abrasive wheels when grinding these two kinds of nickel-base superalloy material is generally identical. The sensitivity of GH4169 workpiece surface roughness to depth of cut and workpiece infeed speed is higher than that of FGH96, but the sensitivity of GH4169 to abrasive wheel speed is less than that of FGH96. Finally, it is inferred that the grinding performance of FGH96 is slightly better than that of GH4169.

37 citations