Investigation on the heat transfer characteristics of propylene glycol–water mixture in the shell side of a spiral‐wound heat exchanger

Gu, Xiaoyong; Jiang, Guohe; Sun, Wei; Wo, Yang; Zou, Xiangyi

doi:10.1002/htj.21910

Cited by 7 publications

(5 citation statements)

References 27 publications

(46 reference statements)

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“…In general, the vortex distribution area in the quasisteady-state calculation was extensive, and the quasi-steady-state assumption could not be used to predict transient behavior. The other behavior is also found in other flow (Gu et al (2020), Abed et al (2020), Xue et al (2022), Dai et al (2021)).…”

Section: Introductionsupporting

confidence: 75%

Diagnosis of Centrifugal Pump Speed Fluctuation by Using Vortex Dynamics

Zhang¹,

Cheng²,

Li³

2022

Front. Heat Mass Transf.

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The internal characteristics during rotational speed fluctuation have an important influence on centrifugal pump to avoid or utilize its transient performance. In this paper, a circulation piping system that includes a low-specific-speed centrifugal pump is established to study the energy distribution characteristics in a centrifugal pump during speed fluctuation. The unsteady flow in the entire system is numerically calculated with a user-defined function, the sliding grid method, and the RNG k-ε turbulence model. Then, the energy distribution of the transient flow field in the centrifugal pump model during speed fluctuation is diagnosed with vortex dynamics by using flow section and boundary vorticity flow diagnosis methods. Results confirm that the total pressure flow energy is relatively high in the process of speed reduction because of the small hydraulic loss, and the opposite was observed in the process of speed increase. The change laws of instantaneous dimensionless head and instantaneous dimensionless flow during speed fluctuation are contrary to that of speed fluctuation. This study provides a reference for the investigation of energy distribution characteristics in the process of speed fluctuation.

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Section: Introductionsupporting

confidence: 75%

Diagnosis of Centrifugal Pump Speed Fluctuation by Using Vortex Dynamics

Zhang¹,

Cheng²,

Li³

2022

Front. Heat Mass Transf.

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“…It is found that the fluid flow and the duration of the circuit during pump stop is affected by the inertia of the pump rotor and the fluid inertia. Moreover, some transient behavior is also found in other classical flow (Abed et al (2020), Gu et al (2020)).…”

Section: Introductionsupporting

confidence: 56%

Comparison of Transient Characteristics of a Centrifugal Pump During Forward and Reverse Stopping Periods

Li¹,

Zhang²,

Huang³

et al. 2022

Frontiers in Heat and Mass Transfer

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Centrifugal pumps need to be stopped in the case of closing valve sometimes due to some specific application requirements. This paper presents a numerical simulation of the unsteady flow inside a low specific speed centrifugal pump during closed-valve forward and reverse stopping process. The study results show that the average internal pressure gradually decreases during stopping periods. At the same blade radius, the pressure on working surface is significantly higher than the suction surface. The pressure gradually increases from the impeller inlet to the outlet. The simulation fully shows the transient flow characteristics inside the centrifugal pump during forward and reverse stopping period.

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“…In addition, the secondary flow induced by the centrifugal force in helically coiled tubes leads to better heat transfer rates as seen in heat exchangers for various applications (Naphon and Wongwises, 2006;Gu et al, 2020). Many studies have investigated the heat transfer in helically coiled tubes to study the effects of the geometric and flow parameters on the heat transfer (Ghorbani et al, 2010;Piazza and Ciofalo, 2010;Chingulpitak and Wongwises, 2010;Ferng et al, 2012).…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Modeling of the Heat Transfer in a Supercritical Co2/Dme Mixture Flowing in Cooled Helically Coiled Tubes

Ba¹,

Chen²,

Li³

2021

Frontiers in Heat and Mass Transfer

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The heat transfer of supercritical CO2/DME mixtures was modeled in this study for a mass ratio of 95/5 for cooling in horizontal helically coiled tubes. The CO2/DME heat transfer coefficient was higher in the high-temperature zone than with pure CO2. The heat transfer of CO2/DME (95/5) was predicted for various mass fluxes, heat fluxes and pressures. The CO2/DME heat transfer coefficient increased with the mass flux due to the increased turbulent diffusion, and first increased but then decreased with the heat flux. The peak heat transfer coefficient of CO2/DME shifted toward the high-temperature region as the operating pressure increased. The effects of buoyancy and the centrifugal force were also analyzed to better understand the heat transfer mechanisms in helically coiled tubes. The gravitational buoyancy effect on the heat transfer decreased with mass flux while increased with heat flux. Higher heat fluxes strengthened the centrifugal buoyancy effect on the heat transfer at the beginning of the cooling process but weakened the centrifugal buoyancy effect later in the cooling process. The present study gives insight into the flow and heat transfer processes in helically coiled tubes which is useful for heat exchanger designs and refrigerant selection.

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Investigation on the heat transfer characteristics of propylene glycol–water mixture in the shell side of a spiral‐wound heat exchanger

Cited by 7 publications

References 27 publications

Diagnosis of Centrifugal Pump Speed Fluctuation by Using Vortex Dynamics

Diagnosis of Centrifugal Pump Speed Fluctuation by Using Vortex Dynamics

Comparison of Transient Characteristics of a Centrifugal Pump During Forward and Reverse Stopping Periods

Modeling of the Heat Transfer in a Supercritical Co2/Dme Mixture Flowing in Cooled Helically Coiled Tubes

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