The difference in flow pattern, heat transfer and pressure drop characteristics of mini-channel flow boiling in horizontal and vertical orientations

Saisorn, Sira; Wongpromma, Pakorn

doi:10.1016/j.ijmultiphaseflow.2018.01.005

Cited by 40 publications

(10 citation statements)

References 59 publications

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“…The investigation results and the division of these four stages are in accord with the results obtained by other researchers …”

Section: Experimental Setup and Bubble Growth Characteristics Of Boilsupporting

confidence: 91%

“…From the onset of the bubble to the time when the sensing section is filled with vapor, it lasts only about 12.5 ms. That means the boiling process is much faster than the steady measurement process in the field of analytic chemistry. The response speed of the conventional CCD sensor cannot meet the requirement of the online monitoring of boiling process in mini‐channels . A new CCD sensor should be developed.…”

Section: Experimental Setup and Bubble Growth Characteristics Of Boilmentioning

confidence: 99%

“…A channel with inner diameter of 1.0–3.0 mm is usually considered as a mini‐channel which is the transition between conventional scale channels and micro scale channels . With the development of modern industry, different kinds of mini‐channel heat exchangers become more and more important and are frequently encountered in many industrial fields, such as heat‐pipes, refrigeration evaporators/condensers, horizontal tubular evaporators, compact bean and tube heat exchangers, etc . For a mini‐channel heat exchanger, boiling is a common phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…For a mini‐channel heat exchanger, boiling is a common phenomenon. Since the heat performance and safety of a mini‐channel exchanger is strongly linked to the different boiling stages/states which reflect different bubble behaviors and heat transfer characteristics, the online monitoring of boiling process is of great importance for the operational heat transfer efficiency and stability of a mini‐channel heat exchanger …”

Section: Introductionmentioning

confidence: 99%

“…The optical instrument (such as a high speed camera, an infrared camera, or a laser sensor) is the most commonly used approach to monitor the boiling process . Besides, temperature sensors (thermocouples) and pressure sensors are also adopted . However, the conventional monitoring tools still do not meet the higher and higher requirements of academic researches and industrial applications .…”

Section: Introductionmentioning

confidence: 99%

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A new method for online monitoring of boiling process in mini‐channels

et al. 2019

AIChE Journal

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A new method for online monitoring of boiling process, which is suitable for conductive fluids in mini‐channels, is proposed with the introduction of contactless conductivity detection (CCD) technique and perceptron algorithm (PA) technique. Series resonance principle and simulated inductor technique were adopted to develop a new CCD sensor. PA was used to implement the boiling stage identification, i.e., to identify the current stage was which stage of the boiling process. Three prototypes of the CCD sensors with inner diameters of 1.6, 2.0, and 2.5 mm were developed. With three kinds of conductive fluids (tap water, ethanol–tap water mixture, and KCl solution), boiling experiments were carried out. The experimental results show that the CCD sensor can effectively track the bubble growth of boiling process. The research results also indicate that the proposed method is effective and the identification accuracies are greater than 90.0%. © 2019 American Institute of Chemical Engineers AIChE J, 65: 1365–1375, 2019

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“…The investigation results and the division of these four stages are in accord with the results obtained by other researchers …”

Section: Experimental Setup and Bubble Growth Characteristics Of Boilsupporting

confidence: 91%

Section: Experimental Setup and Bubble Growth Characteristics Of Boilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new method for online monitoring of boiling process in mini‐channels

et al. 2019

AIChE Journal

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Introduction

2021

Two‐Phase Heat Transfer

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Flow boiling heat transfer characteristics using the modified eulerian and wall heat balance model

Okon

Turan

2020

Heat Mass Transfer

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Flow boiling heat transfer is routinely encountered in nuclear reactors, steam engines and other engineering applications. Although several researchers have carried out different numerical and experimental investigations on flow boiling, the underlying physics of the interfacial interaction is still a complex phenomenon to understand in detail. Hence, the numerical simulation and optimisation regarding the adoption of engineering flow boiling parameters have been conducted in this study using the Modified Eulerian-Eulerian Model (MEEM) and Wall Heat Balance Model (WHBM). To predict interpenetrating flow fields and to provide detailed relevant information on the flow behaviour, this study considered a uniform axial heating profile for a cylindrical flow channel. The Raynolds Average Navier Stokes (RANS) equation with an appropriate turbulence model are used to predict the effect of turbulence on the mean flow field, while the MEEM multiphase sub-models are employed to predict the temperature distribution along the wall, the average void fraction, tracking of the single bubble detachment diameter, heat balance at the wall, effect of surface roughness on heat transfer, the effect of aspect ratio, and the critical heat flux. The results obtained from this study are compared with the selected numerical investigation and experimental data presented in the open literature. The present study shows a better approximate prediction (with minimal uncertainties) of both the subcooled boiling heat transfer and the saturated boiling heat transfer. In summary, this study agrees with extant theories and experimental predictions. Thus, it has provided more profound insights into flow boiling heat transfer particularly for flow in a vertical pipe.

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The difference in flow pattern, heat transfer and pressure drop characteristics of mini-channel flow boiling in horizontal and vertical orientations

Cited by 40 publications

References 59 publications

A new method for online monitoring of boiling process in mini‐channels

A new method for online monitoring of boiling process in mini‐channels

Introduction

Flow boiling heat transfer characteristics using the modified eulerian and wall heat balance model

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