The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
L. Tadrist - One of the best experts on this subject based on the ideXlab platform.
-
Local heat transfer analysis for boiling of hydrocarbons in complex geometries: A new approach for heat transfer prediction in staggered tube bundle
International Journal of Heat and Mass Transfer, 2011Co-Authors: L. Aprin, P. Mercier, L. TadristAbstract:This paper deals with heat transfer analysis for boiling flow in staggered tube bundle. A local analysis is performed to determine the heat transfer coefficient linked to local flow regimes by optical fibre. The first part of the paper is devoted to the literature survey of the main existing studies on the topic. We show that published heat transfer Correlations deviate largely from each others and also from the experimental results that have been carried out. On these features, a new approach has been developed. It is based on the relationship between flow regimes and thermal characteristics. An experimental setup has been developed for the determination of the local heat transfer and the two-phase flow void fraction. A detailed analysis of the two-phase flow has been performed in a previous paper [1] in which two regimes were identified. In the present paper, focus is done on the heat transfer analysis in relation with the flow regime map. This new approach allows a better prediction of the heat transfer coefficient. For the bubbly flow, the heat transfer coefficient is well predicted by a Classical Correlation corresponding to nucleate boiling regime. For the dispersed flow, Classical Correlations for convective boiling are not adapted any-more for tube bundle. We evidenced that heat coefficient is mainly controlled by the vapour flow and a heat transfer law is derived using the vapour Reynolds number and vapour Prandlt number. These two heat transfer laws are used to evaluate heat transfer coefficient in the intermediate regime. (C) 2011 Elsevier Ltd. All rights reserved.
Shigeki Takeuchi - One of the best experts on this subject based on the ideXlab platform.
-
Detection of superposition in the orbital angular momentum of photons without excess components and its application in the verification of non-Classical Correlation
Journal of Optics, 2011Co-Authors: Yoko Miyamoto, Daisuke Kawase, Mitsuo Takeda, Keiji Sasaki, Shigeki TakeuchiAbstract:Orbital angular momentum states (Laguerre–Gaussian modes) of photons are attracting attention for realizing a high-dimensional quantum space, and several experimental verifications of entanglement have been reported. Some of these experiments measure photons in the superposition of different azimuthal modes by shifting the hologram dislocation. But this method has the problem that various unneeded azimuthal modes mix in the measurement basis. In order to solve this problem, we propose a new method using a hologram and a path interferometer. We also report an experimental observation of non-Classical Correlation in the orbital angular momentum of photons by use of the proposed method.
-
Verification of non-Classical Correlation in orbital angular momentum of photons without excess components
2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian, 2011Co-Authors: Yoko Miyamoto, Daisuke Kawase, Mitsuo Takeda, Keiji Sasaki, Shigeki TakeuchiAbstract:We propose a method to detect photons in superposition of orbital angular momentum (OAM) states using a hologram and path interferometer, and its application to verification of non-Classical Correlation in photon pairs. The method is free from excess OAM components, and a simple assumption of Classical OAM Correlation between the two photons removes contributions from excess components from the coincidence curve as well, even when the proposed method is used only on one of the photons.
L. Aprin - One of the best experts on this subject based on the ideXlab platform.
-
Local heat transfer analysis for boiling of hydrocarbons in complex geometries: A new approach for heat transfer prediction in staggered tube bundle
International Journal of Heat and Mass Transfer, 2011Co-Authors: L. Aprin, P. Mercier, L. TadristAbstract:This paper deals with heat transfer analysis for boiling flow in staggered tube bundle. A local analysis is performed to determine the heat transfer coefficient linked to local flow regimes by optical fibre. The first part of the paper is devoted to the literature survey of the main existing studies on the topic. We show that published heat transfer Correlations deviate largely from each others and also from the experimental results that have been carried out. On these features, a new approach has been developed. It is based on the relationship between flow regimes and thermal characteristics. An experimental setup has been developed for the determination of the local heat transfer and the two-phase flow void fraction. A detailed analysis of the two-phase flow has been performed in a previous paper [1] in which two regimes were identified. In the present paper, focus is done on the heat transfer analysis in relation with the flow regime map. This new approach allows a better prediction of the heat transfer coefficient. For the bubbly flow, the heat transfer coefficient is well predicted by a Classical Correlation corresponding to nucleate boiling regime. For the dispersed flow, Classical Correlations for convective boiling are not adapted any-more for tube bundle. We evidenced that heat coefficient is mainly controlled by the vapour flow and a heat transfer law is derived using the vapour Reynolds number and vapour Prandlt number. These two heat transfer laws are used to evaluate heat transfer coefficient in the intermediate regime. (C) 2011 Elsevier Ltd. All rights reserved.
Jinshi Xu - One of the best experts on this subject based on the ideXlab platform.
-
quantum Correlation and Classical Correlation dynamics in the spin boson model
Physical Review A, 2010Co-Authors: Rongchun Ge, Ming Gong, Chuanfeng Li, Jinshi XuAbstract:We study the quantum Correlation and Classical Correlation dynamics in a spin-boson model. For two different forms of spectral density, we obtain analytical results and show that the evolutions of both Correlations depend closely on the form of the initial state. At the end of evolution, all Correlations initially stored in the spin system transfer to reservoirs. It is found that, for a large family of initial states, quantum Correlation remains equal to the Classical Correlation during the course of evolution. In addition, there is no increase in the Correlations during the course of evolution.
Changshui Yu - One of the best experts on this subject based on the ideXlab platform.
-
the Classical Correlation limits the ability of the measurement induced average coherence
Scientific Reports, 2017Co-Authors: Jun Zhang, Siren Yang, Yang Zhang, Changshui YuAbstract:Coherence is the most fundamental quantum feature in quantum mechanics. For a bipartite quantum state, if a measurement is performed on one party, the other party, based on the measurement outcomes, will collapse to a corresponding state with some probability and hence gain the average coherence. It is shown that the average coherence is not less than the coherence of its reduced density matrix. In particular, it is very surprising that the extra average coherence (and the maximal extra average coherence with all the possible measurements taken into account) is upper bounded by the Classical Correlation of the bipartite state instead of the quantum Correlation. We also find the sufficient and necessary condition for the null maximal extra average coherence. Some examples demonstrate the relation and, moreover, show that quantum Correlation is neither sufficient nor necessary for the nonzero extra average coherence within a given measurement. In addition, the similar conclusions are drawn for both the basis-dependent and the basis-free coherence measure.
-
probing quantum entanglement quantum discord Classical Correlation and the quantum state without disturbing them
Physical Review A, 2011Co-Authors: Zhenni Li, Changshui YuAbstract:We present schemes for a type of one-parameter bipartite quantum state to probe quantum entanglement, quantum discord, the Classical Correlation, and the quantum state based on cavity QED. It is shown that our detection does not influence all these measured quantities. We also discuss how the spontaneous emission introduced by our probe atom influences our detection.