Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures

The heat transfer and pressure drop characteristics of R290 flow boiling in a corrugated tube were investigated through computational fluid dynamics (CFD) in this study. We established a model of flow boiling in a corrugated tube with different corrugated structures (rectangular and circular corruga...

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Autores principales:	Shenglin Zhu, Jinfeng Wang, Jing Xie
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	R290 flow boiling numerical simulation heat transfer corrugated tube Mathematics QA1-939
Acceso en línea:	https://doaj.org/article/244b4b3c01c144a781048c7ec32bf5e5
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spelling	oai:doaj.org-article:244b4b3c01c144a781048c7ec32bf5e52021-11-25T18:17:42ZNumerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures10.3390/math92229692227-7390https://doaj.org/article/244b4b3c01c144a781048c7ec32bf5e52021-11-01T00:00:00Zhttps://www.mdpi.com/2227-7390/9/22/2969https://doaj.org/toc/2227-7390The heat transfer and pressure drop characteristics of R290 flow boiling in a corrugated tube were investigated through computational fluid dynamics (CFD) in this study. We established a model of flow boiling in a corrugated tube with different corrugated structures (rectangular and circular corrugations) and validated the model using the Liu–Winterton and Xu–Fang empirical equations. The heat transfer coefficient (HTC) and pressure drop were obtained at a mass flow rate of 0.04–0.2 kg/s and a water inlet temperature of 310–330 K. The results show that the HTC and the drop in the pressure of the corrugated tubes both obviously increased compared with a smooth tube as the mass flow rate increased. The HTC decreased for the three tubes as the water inlet temperature increased, while the drop in pressure slightly increased for the three tubes. Moreover, the corrugated structure was found to significantly enhance the heat transfer; the heat transfer enhancement factor (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">E</mi><mn>1</mn></msub></mrow></semantics></math></inline-formula>) of the corrugated tube with the rectangular corrugations and the corrugated tube with the circular corrugations was 2.01–2.36 and 1.67–1.98, respectively. The efficiency index (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>I</mi></semantics></math></inline-formula>) for both the rectangular corrugated pipe and the circular corrugated pipe was greater than 1 (1.05–1.24 and 1.13–1.29, respectively). The application of corrugated tubes with round and rectangular corrugations can reduce the heat transfer area required for the exchange of heat and, thus, reduce the cost.Shenglin ZhuJinfeng WangJing XieMDPI AGarticleR290flow boilingnumerical simulationheat transfercorrugated tubeMathematicsQA1-939ENMathematics, Vol 9, Iss 2969, p 2969 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	R290 flow boiling numerical simulation heat transfer corrugated tube Mathematics QA1-939
spellingShingle	R290 flow boiling numerical simulation heat transfer corrugated tube Mathematics QA1-939 Shenglin Zhu Jinfeng Wang Jing Xie Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures
description	The heat transfer and pressure drop characteristics of R290 flow boiling in a corrugated tube were investigated through computational fluid dynamics (CFD) in this study. We established a model of flow boiling in a corrugated tube with different corrugated structures (rectangular and circular corrugations) and validated the model using the Liu–Winterton and Xu–Fang empirical equations. The heat transfer coefficient (HTC) and pressure drop were obtained at a mass flow rate of 0.04–0.2 kg/s and a water inlet temperature of 310–330 K. The results show that the HTC and the drop in the pressure of the corrugated tubes both obviously increased compared with a smooth tube as the mass flow rate increased. The HTC decreased for the three tubes as the water inlet temperature increased, while the drop in pressure slightly increased for the three tubes. Moreover, the corrugated structure was found to significantly enhance the heat transfer; the heat transfer enhancement factor (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi mathvariant="normal">E</mi><mn>1</mn></msub></mrow></semantics></math></inline-formula>) of the corrugated tube with the rectangular corrugations and the corrugated tube with the circular corrugations was 2.01–2.36 and 1.67–1.98, respectively. The efficiency index (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>I</mi></semantics></math></inline-formula>) for both the rectangular corrugated pipe and the circular corrugated pipe was greater than 1 (1.05–1.24 and 1.13–1.29, respectively). The application of corrugated tubes with round and rectangular corrugations can reduce the heat transfer area required for the exchange of heat and, thus, reduce the cost.
format	article
author	Shenglin Zhu Jinfeng Wang Jing Xie
author_facet	Shenglin Zhu Jinfeng Wang Jing Xie
author_sort	Shenglin Zhu
title	Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures
title_short	Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures
title_full	Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures
title_fullStr	Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures
title_full_unstemmed	Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures
title_sort	numerical investigation of the heat transfer characteristics of r290 flow boiling in corrugated tubes with different internal corrugated structures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/244b4b3c01c144a781048c7ec32bf5e5
work_keys_str_mv	AT shenglinzhu numericalinvestigationoftheheattransfercharacteristicsofr290flowboilingincorrugatedtubeswithdifferentinternalcorrugatedstructures AT jinfengwang numericalinvestigationoftheheattransfercharacteristicsofr290flowboilingincorrugatedtubeswithdifferentinternalcorrugatedstructures AT jingxie numericalinvestigationoftheheattransfercharacteristicsofr290flowboilingincorrugatedtubeswithdifferentinternalcorrugatedstructures
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Numerical Investigation of the Heat Transfer Characteristics of R290 Flow Boiling in Corrugated Tubes with Different Internal Corrugated Structures

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