Two-Phase Flow, Boiling and Condensation in Conventional and Miniature Systems

Ghiaasiaan, S. Mostafa

doi:10.1017/cbo9780511619410.003

Cited by 85 publications

(141 citation statements)

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“…Not surprisingly the physics of the flow behaviour and quantification of the heat transfer is more complex than in pool boiling. However Ghiaasiaan (2008) [15] provides an excellent review of flow boiling regimes and useful heat transfer correlations.…”

Section: Heat Transfer In Boilingmentioning

confidence: 99%

A review of evaporative cooling system concepts for engine thermal management in motor vehicles

Jafari

Dunne

Langari

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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The evaporative cooling system concepts proposed over the past century for engine thermal management in automotive applications are examined and critically reviewed. The purposes of this review are to establish the evident system shortcomings and to identify the remaining research questions that need to be addressed to enable this important technology to be adopted by vehicle manufacturers. Initially, the benefits of the evaporative cooling systems are restated in terms of the improved engine efficiency, the reduced carbon dioxide emissions and the improved fuel economy. This is followed by a historical coverage of the proposed concepts dating back to 1918. Possible evaporative cooling concepts are then classified into four distinct classes and critically reviewed. This culminates in an assessment of the available evidence to establish the reasons why no system has yet been approved for serial production commercially. Then, by systematic examination of the critical areas in evaporative cooling systems for application to automotive engine cooling, the remaining research challenges are identified

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Section: Heat Transfer In Boilingmentioning

confidence: 99%

A review of evaporative cooling system concepts for engine thermal management in motor vehicles

Jafari

Dunne

Langari

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…the mixture model as derived by performing a differential analysis on each phase and adding the phasic equations [17]. The result is the mixture mass conservation, the mixture momentum conservation and the mixture energy conservation equations given by…”

Section: A1 Mixture Two-phase Flowmentioning

confidence: 99%

Modeling the discontinuous individual channel injection into fin-and-tube evaporators for residential air-conditioning

Kærn

2012

Linköping Electronic Conference Proceedings

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In this paper a working principle based upon the novel expansion and distributor device EcoFlow TM is analyzed. The device enables compensation of flow maldistribution by control of individual channel superheat. The working principle is discontinuous liquid injection (pulsating flow) into each individual channels during a specified cycle time. Moreover, the influence of the injection cycle time is investigated together with an optional secondary flow into the other channels with regards to cooling capacity, overall UA-value and COP.The results showed spurious fluctuations in pressure when simulating the pulsating flow, thus the dynamic behavior in the mixture two-phase flow model is insufficient to model the discontinuous liquid injection principle. Despite, the fluctuations and imperfections of the model we found that the cycle time should be kept as low as possible and that the optional secondary flow increases performance. Moreover, the paper reports on the applicability of Modelica developed models to analyze and optimize the working principle and design of expansion devices such that Modelica may be used in future development of novel discontinuous expansion devices.

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“…the mixture model as derived by performing a differential analysis of each phase and adding the phasic equations (Ghiaasiaan, 2008). The result is the mixture mass conservation, the mixture momentum conservation and the mixture energy conservation, given by…”

Section: Refrigerant Flowmentioning

confidence: 99%

Performance of residential air-conditioning systems with flow maldistribution in fin-and-tube evaporators

Kærn

Brix

Elmegaard

et al. 2011

International Journal of Refrigeration

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Refrigerant and airflow maldistribution in fin-and-tube evaporators for residential air-conditioning was investigated with numerical modeling. Fin-and-tube heat exchangers usually have a pre-defined circuitry. However, the objective in this study was to perform a generic investigation of each individual maldistribution source in an independent manner. Therefore, the evaporator and the condenser were simplified to be straight tubes for the purposes of this study. The numerical model of the R410A system, its verification and an investigation of individual maldistribution sources are presented in this paper. The maldistribution sources of interest were: inlet liquid/vapor phase distribution, feeder tube bending and airflow distribution. The results show that maldistribution reduced the cooling capacity and the coefficient of performance of the system. In particular, different phase distribution and non-uniform airflow distribution reduced the performance significantly. Different feeder tube bendings only caused a minor decrease in performance.

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Two-Phase Flow, Boiling and Condensation in Conventional and Miniature Systems

Cited by 85 publications

References 0 publications

A review of evaporative cooling system concepts for engine thermal management in motor vehicles

A review of evaporative cooling system concepts for engine thermal management in motor vehicles

Modeling the discontinuous individual channel injection into fin-and-tube evaporators for residential air-conditioning

Performance of residential air-conditioning systems with flow maldistribution in fin-and-tube evaporators

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