Effect of lubricant oil on boiling heat transfer and flow patterns of R32 inside a multiport tube

Jige, Daisuke; Kikuchi, Shogo; Eda, Hikaru; Inoue, N.

doi:10.1016/j.expthermflusci.2020.110146

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…As shown in Figure 20a, Eq. ( 7) fit 23.3% of the extended laminar evaporation pressure drop data [54][55][56] within ±10%, 65.3% in ±30%, and 87.9% in ±50%. The corresponding low values of MBD and RMSD at À1.5% and 30.8% confirm the accuracy and reliability of Eq.…”

Section: Evaporationmentioning

confidence: 81%

“…Hence, only studies with multiport minichannel tubes were included in the extended database. The condensation evaluation data are listed in Table 7 [4, 5, 7-10, 26, 31, 49-53], while the evaporation evaluation data are shown in Table 8 [29,31,36,[54][55][56].…”

Section: Validation Of the Predictive Correlationsmentioning

confidence: 99%

“…Chien et al [36] reported the evaporation friction pressure drop for R-717 and R-290 in a 0.83 mm multiport minichannel evaporator. Experiments were conducted at mass flux G ¼ 500 kg/m 2 s and saturation temperature T sat ¼ 6 C. Jige et al [54] measured the friction pressure drop gradient during the condensation of R32 with and without lubricants in a 0.82 mm multiport minichannel evaporator. The mass flux G varied from 200 kg/ m 2 s to 400 kg/m 2 s, while the saturation temperature was T sat ¼ 15 C and vapor quality x ¼ 0.1-0.9.…”

Section: Evaporationmentioning

confidence: 99%

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A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

Mukkamala

Dirker

2022

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Due to flow maldistribution, the condensation and evaporation flow patterns in multiport minichannels are considerably different from single minichannels or macrochannels. This article compiled the friction pressure drop data from experimental phase-change investigations in multiport minichannel condensers and evaporators over the past two decades. The data was reduced to friction pressure gradients, and a new two-phase multiplier was proposed for estimating the phase-change pressure drop in multiport condensers and evaporators. Thirteen hundred and forty-four condensation pressure drop and six hundred and twentythree evaporation pressure drop data from twenty-nine studies were correlated to yield four predictive two-phase multiplier equations in the laminar and turbulent flow regimes. The predictive correlations fit 67% of the laminar condensation and 80% of the turbulent pressure drop data within ±50%. Further, 57% of the laminar evaporation and 100% of the turbulent evaporation pressure drop data were fit within ±50%. The correlations were compared with widely published correlations and were a significant improvement. Metaanalysis revealed that multiport minichannels are most effective for reducing turbulent flow condensation pressure drop and laminar flow evaporation pressure drop. The compiled data and presented correlations and analysis should be helpful to the process, electronics packaging, aviation, and aerospace industries designing compact, lightweight, and high-efficiency condensers, and evaporators.

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Section: Evaporationmentioning

confidence: 81%

Section: Validation Of the Predictive Correlationsmentioning

confidence: 99%

Section: Evaporationmentioning

confidence: 99%

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A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

Mukkamala

Dirker

2022

Heat Transfer Engineering

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Essential technologies on the direct cooling thermal management system for electric vehicles

Yang

Zhou

et al. 2021

Intl J of Energy Research

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As the increasing concern of degradation or thermal runaway of lithium-ion batteries, direct cooling system on electric vehicles draws much attention and has been broadly researched. Although satisfactory energy efficiency and thermal performance can be achieved according to current appliances, in-depth discussion of system design and modeling is still necessary for providing mature applications. Herein, a comprehensive review of direct cooling system is presented, and essential components on the overall design are introduced as 4C chain (construction of the system, component modeling, cooling plate design, and coolant selection). Construction, coolant, cooling plate, and component modeling are presented independently for discussing the research progress, where detailed information is provided contributing to the selection of essential components. Moreover, the typical applications on electric vehicles of direct cooling are also investigated, and more productions are under research. Apart from system designing, the environmental fitness is also considered and the defects are summarized for system optimization.Considering to achieve future innovative application, digital twin model-based method is delivered for providing the guidance of prospective direct cooling system design, and the method enhances the potential to achieve better thermal management based on digital technologies and cloud-control platform. Based on the innovative development of cloud-controlling platform design and electronic and electrical architecture, the cloud battery controlling provides the chances for online elaborate model-based operation and precise model-based controlling strategy for novel direct cooling system. Novelty StatementA comprehensive review on the general construction of system is presented, and essential components of direct cooling system are also summarized for optimizing the system efficiency. The article highlights the research profile of

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Experimental investigation on oil transport, heat transfer and distribution performances of R32/oil mixture in microchannel evaporators

Zeng

Zhang²,

Hu³

et al. 2022

Applied Energy

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Effect of lubricant oil on boiling heat transfer and flow patterns of R32 inside a multiport tube

Cited by 12 publications

References 14 publications

A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

A New Two-Phase Multiplier for Flow Pressure Drop in Multiport Minichannel Condensers and Evaporators

Essential technologies on the direct cooling thermal management system for electric vehicles

Experimental investigation on oil transport, heat transfer and distribution performances of R32/oil mixture in microchannel evaporators

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