Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels

The aim of this study was to reveal the internal mechanism of enhanced condensation heat transfer, by experimentally performing steam condensation with higher inlet velocity in the horizontal multi-start helical channels (HMSHCs), and investigating the influences of pressure of steam, mass flowrate...

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Autores principales:	Wen Jianjun, Dou Zhi, Zhong Jiaqi, Niu Yonghong, Hu Zhenwei, Zheng Dan
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	enhanced steam condensation horizontal multi-start helical channels correlations performance evaluation factor Physics QC1-999
Acceso en línea:	https://doaj.org/article/81644d9778904d9a9d8caa887003b55d
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spelling	oai:doaj.org-article:81644d9778904d9a9d8caa887003b55d2021-12-05T14:11:02ZExperimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels2391-547110.1515/phys-2021-0069https://doaj.org/article/81644d9778904d9a9d8caa887003b55d2021-11-01T00:00:00Zhttps://doi.org/10.1515/phys-2021-0069https://doaj.org/toc/2391-5471The aim of this study was to reveal the internal mechanism of enhanced condensation heat transfer, by experimentally performing steam condensation with higher inlet velocity in the horizontal multi-start helical channels (HMSHCs), and investigating the influences of pressure of steam, mass flowrate of cooling water, and mass fraction of noncondensable (NC) gas on steam condensation performance. Taking steam condensation in horizontal circular condensation channel (HCCC) as a reference, the condensation heat transfer coefficients (CHTCs), the outlet condensate mass flowrates (CMFRs), and the total steam condensation pressure drops (SCPDs) were compared and discussed, respectively. The results indicated that NC gas had a strong inhibitory effect on steam condensation, and average condensation characteristics decreased with the increase in NC gas fraction for lower Rem. But for higher Rem, the gas–liquid interfacial shearing stress can likely weaken the negative effect of NC gas. In addition, increasing the cooling water flowrate can entirety promote steam condensation. The comparison results indicated that steam condensation performance of HMSHC is better than that of HCCC under same experimental conditions. For the specific experimental scope, the average CHTCs and the outlet CMFRs in HMSHC are approximately 2.35 and 1.25 times of that inside HCCC, respectively, while the overall SCPDs in HMSHC are about 1.16 times of that inside HCCC. After introducing the performance evaluation factor, the calculation results revealed that the performance evaluation factor hPEC{h}_{\text{PEC}} of the average CHTCs in HMSHC is approximately 2.02, and the performance evaluation factor mPEC{{m}}_{\text{PEC}} of the outlet CMFRs in HMSHC is approximately 1.08. The two evaluating values are reasonable.Wen JianjunDou ZhiZhong JiaqiNiu YonghongHu ZhenweiZheng DanDe Gruyterarticleenhanced steam condensationhorizontal multi-start helical channelscorrelationsperformance evaluation factorPhysicsQC1-999ENOpen Physics, Vol 19, Iss 1, Pp 634-646 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	enhanced steam condensation horizontal multi-start helical channels correlations performance evaluation factor Physics QC1-999
spellingShingle	enhanced steam condensation horizontal multi-start helical channels correlations performance evaluation factor Physics QC1-999 Wen Jianjun Dou Zhi Zhong Jiaqi Niu Yonghong Hu Zhenwei Zheng Dan Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
description	The aim of this study was to reveal the internal mechanism of enhanced condensation heat transfer, by experimentally performing steam condensation with higher inlet velocity in the horizontal multi-start helical channels (HMSHCs), and investigating the influences of pressure of steam, mass flowrate of cooling water, and mass fraction of noncondensable (NC) gas on steam condensation performance. Taking steam condensation in horizontal circular condensation channel (HCCC) as a reference, the condensation heat transfer coefficients (CHTCs), the outlet condensate mass flowrates (CMFRs), and the total steam condensation pressure drops (SCPDs) were compared and discussed, respectively. The results indicated that NC gas had a strong inhibitory effect on steam condensation, and average condensation characteristics decreased with the increase in NC gas fraction for lower Rem. But for higher Rem, the gas–liquid interfacial shearing stress can likely weaken the negative effect of NC gas. In addition, increasing the cooling water flowrate can entirety promote steam condensation. The comparison results indicated that steam condensation performance of HMSHC is better than that of HCCC under same experimental conditions. For the specific experimental scope, the average CHTCs and the outlet CMFRs in HMSHC are approximately 2.35 and 1.25 times of that inside HCCC, respectively, while the overall SCPDs in HMSHC are about 1.16 times of that inside HCCC. After introducing the performance evaluation factor, the calculation results revealed that the performance evaluation factor hPEC{h}_{\text{PEC}} of the average CHTCs in HMSHC is approximately 2.02, and the performance evaluation factor mPEC{{m}}_{\text{PEC}} of the outlet CMFRs in HMSHC is approximately 1.08. The two evaluating values are reasonable.
format	article
author	Wen Jianjun Dou Zhi Zhong Jiaqi Niu Yonghong Hu Zhenwei Zheng Dan
author_facet	Wen Jianjun Dou Zhi Zhong Jiaqi Niu Yonghong Hu Zhenwei Zheng Dan
author_sort	Wen Jianjun
title	Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
title_short	Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
title_full	Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
title_fullStr	Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
title_full_unstemmed	Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
title_sort	experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/81644d9778904d9a9d8caa887003b55d
work_keys_str_mv	AT wenjianjun experimentalstudyonenhancementcharacteristicsofsteamnitrogencondensationinsidehorizontalmultistarthelicalchannels AT douzhi experimentalstudyonenhancementcharacteristicsofsteamnitrogencondensationinsidehorizontalmultistarthelicalchannels AT zhongjiaqi experimentalstudyonenhancementcharacteristicsofsteamnitrogencondensationinsidehorizontalmultistarthelicalchannels AT niuyonghong experimentalstudyonenhancementcharacteristicsofsteamnitrogencondensationinsidehorizontalmultistarthelicalchannels AT huzhenwei experimentalstudyonenhancementcharacteristicsofsteamnitrogencondensationinsidehorizontalmultistarthelicalchannels AT zhengdan experimentalstudyonenhancementcharacteristicsofsteamnitrogencondensationinsidehorizontalmultistarthelicalchannels
_version_	1718371482911899648

Experimental study on enhancement characteristics of steam/nitrogen condensation inside horizontal multi-start helical channels

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