The experimental study on the heat transfer and friction factor characteristics in tube with a new kind of twisted tape insert

Man, Changzhong; Yao, Jinyu; Wang, Chong

doi:10.1016/j.icheatmasstransfer.2016.04.003

Cited by 50 publications

(9 citation statements)

References 19 publications

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“…Dengan menggunakan prinsip kekekalan energi antara fluida panas yang masuk dan keluar dengan laju perpindahan panas, laju panas dapat dihitung menggunakan Persamaan (6). (6) dimana adalah laju masa fluida masuk pipa, c p adalah panas jenis pada tekanan konstan dan T in serta T out berturutturut adalah temperatur fluida masuk dan keluar. Laju masa fluida masuk pipa ditentukan dengan menggunakan Persamaan (7).…”

Section: Gambar 2 Geometri Control Volume Dari Domain Komputasiunclassified

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Karakteristik Termal Hidrodinamik Untuk Aliran Laminar Dan Turbulen Di Dalam Pipa Dengan Berbagai Bentuk Sisipan Plat Bergalur

Syaiful

Dzulhimam

2015

Rot.

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The purpose of this study is to investigate the thermal and hydrodynamic characteristics of air flowing in tubes with various inserts of grooved plate. Inserts of grooved plate with a variety of attack angles (a = 0°, 45° and 90°) has been studied in laminar and turbulent flow. Plate inserts are installed inside the tube intended to improve the heat transfer due to the mixing of the fluid. Numerical simulation of three-dimensional flow set as a model in the direction of fluid flow. The working fluid in the tube is cold, whereas hot wall temperature is kept constant. The results showed that the grooved plate inserts increases the heat transfer in the tube. For laminar flow, the highest heat transfer enhancement is obtained at the grooved plate inserts α = 45° i.e. from 4.46 to 20.34% with an increase in friction factor of 172.19 to 204.36%. As for the turbulent flow, the highest heat transfer improvement is found in a grooved plate inserts with α = 45° i.e. from 38.67 to 56.1% with an increase in friction factor of 183.5 to 262.29%.

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Section: Gambar 2 Geometri Control Volume Dari Domain Komputasiunclassified

“…Karakteristik perpindahan panas dan gesekan di dalam pipa dengan sisipan plat terpuntir yang baru diperkenalkan oleh Changzhong Man dkk. melalui kaji eksperimental [6]. Mereka meneliti efek sisipan plat terpuntir yang baru dengan beberapa perbedaan panjang plat terhadap perpindahan panas dan gesekan.…”

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Karakteristik Termal Hidrodinamik Untuk Aliran Laminar Dan Turbulen Di Dalam Pipa Dengan Berbagai Bentuk Sisipan Plat Bergalur

Syaiful

Dzulhimam

2015

Rot.

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“…Esmaeilzadeh et al [20] experimentally revealed that the twisted tape inserts can markedly improve the convective heat transfer of the circular tube. Man et al [21] experimentally studied the heat transfer performance of a twisted tape insert and found that both Nu and f increased significantly.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement in a Novel Annular Tube with Outer Straight and Inner Twisted Oval Tubes

Luo,

Song,

Tagawa

et al. 2020

Symmetry

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The thermal-hydraulic performance in a novel annular tube formed by outer straight and inner twisted oval tubes is numerically investigated. An annular tube formed by two straight oval tubes is also studied for comparison. Inner twisted oval tubes with different aspect ratios and twist ratios are studied. The heat transfer is well improved by the symmetrical secondary flow in the annulus. The Nusselt number generally increases when the inner oval tube becomes flatter and the twists stronger in the studied range of geometrical parameters. The largest Nusselt number Nu of the inner twisted tube increases by 116% while the friction factor f increases by only 46% compared with that of the inner straight tube, and the largest value of the thermal performance factor (JF) can be up to 1.9. Correlations of the Nusselt number and friction factor are proposed for laminar and turbulent flows, and the deviations of the correlations are within ±5% and ±4% for Nu and f, respectively.

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“…These studies were performed either numerically or experimental or both of them. The thermo-hydraulic characteristics of TT engaged tubes were investigated based on different insert properties to analyze the effects of such as twist ratio [4,5], clockwise−counterclockwise arrangement [6,7], cross hollow TT [8], spirally grooved tube [9], spirally grooved tube with overlapped large/small twin TTs [10], two-phase flow [11], V-cut TT [12], coupling of TT with WC [13,14], twin-counter/co-swirl tape [15], double counter TT [16], triple TT [17], and quadruple TT [18].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of heat transfer using twisted tape insert in a plain tube

Yılmaz

Göksu

2019

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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The use of insert within a tube is one of the techniques enhancing the convective heat transfer coefficient at the expense of hydraulic loss penalty. This mutual effect which is a strong function of insert geometry and flow conditions is to be analyzed in detail to improve the overall system performance. This study presents a numerical investigation for analyzing the thermo-hydraulic characteristics of twisted tape insert in a plain tube (with a 13mm-diameter and 1200-mm-long) which is widely used in refrigeration applications where the compactness of the heating/cooling component is significant. The effect of twist ratio on the thermo-hydraulic performance was conducted for the Reynolds number range of 5,025−14,871 where most of refrigeration applications are operated in. The verification of the simulation results was compared to Dittus-Boelter empirical equation (for the plain tube case) and good agreement was obtained. Results indicate that the variation of the twist ratio between 6−9 increases the friction factor and Nusselt number 197−245%, 180−220%, 163−189% and 156−179%, and 32−54%, 28−46%, 28−33% and 28−33% relative to the plain tube case, respectively for the specified operating conditions. The performance evaluation criteria, which are measure of enhancing heat transfer against hydrodynamic forces, changed between 0.90−1.02, 0.89−1.00, 0.91−0.96 and 0.92−0.96 based on the twist ratio rise. The maximum enhancement in the performance evaluation criteria was obtained at the lowest Reynolds number and twist ratio. The performance evaluation criteria lower with increasing Reynolds number but can be increased by increasing the twist ratio.

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The experimental study on the heat transfer and friction factor characteristics in tube with a new kind of twisted tape insert

Cited by 50 publications

References 19 publications

Karakteristik Termal Hidrodinamik Untuk Aliran Laminar Dan Turbulen Di Dalam Pipa Dengan Berbagai Bentuk Sisipan Plat Bergalur

Karakteristik Termal Hidrodinamik Untuk Aliran Laminar Dan Turbulen Di Dalam Pipa Dengan Berbagai Bentuk Sisipan Plat Bergalur

Heat Transfer Enhancement in a Novel Annular Tube with Outer Straight and Inner Twisted Oval Tubes

Enhancement of heat transfer using twisted tape insert in a plain tube

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