Heat transfer and friction characteristics of crimped spiral finned heat exchangers with dehumidification

Nuntaphan, Atipoang; Kiatsiriroat, Tanongkiat; Wang, Chi-Chuan

doi:10.1016/j.applthermaleng.2004.05.014

Cited by 49 publications

(9 citation statements)

References 7 publications

(12 reference statements)

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“…In the measurements performed by Kalisz and Pronobis [15] the upstream side of the tubes was the lower surface of the tubes, i.e., the flow was upward. Nuntaphan and Kiatsiriroat [16] investigated the effect of fly ash deposit on the thermal performance of a cross-flow heat exchanger having a set of spiral-finned tubes as heat transfer surface (Nuntaphan et al [17,18]). The tubes of the heat exchanger were vertically mounted in a staggered array, and the flow was horizontal.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Flow Direction to Minimize Particulate Fouling of Heat Exchangers

Abd-Elhady

Rindt

Steenhoven

2009

Heat Transfer Engineering

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The influence of flow direction with respect to gravity on particulate fouling of heat exchangers is investigated experimentally to determine the optimal flow direction to minimize fouling. Four orientations of flow have been investigated: horizontal flow, upward flow, downward flow, and a flow under an angle of 45 • . It is observed that fouling starts at the point of stagnation irrespective of the flow direction, and also at the top of the heat exchanger tubes. Particulate fouling grows from these two points till they meet and the fouling layer covers the whole surface of the heat exchanger tube. Fouling at the upper half of the tubes is much faster than the lower half of the tubes, and the fouling rate is faster at the bottom tubes of the heat exchanger section than at the upper tubes. The best orientation for lingering particulate fouling is the downward flow, where the flow stagnation point coincides with the top point of the heat exchanger tubes and the growth of the fouling layer only starts from one point.

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Section: Introductionmentioning

confidence: 99%

Optimization of Flow Direction to Minimize Particulate Fouling of Heat Exchangers

Abd-Elhady

Rindt

Steenhoven

2009

Heat Transfer Engineering

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“…Kalisz and Pronobis [16] found that particulate fouling at the economizer of a pulverized coal boiler, in which the gas flow is upwards, occurred at the downstream side of the tubes, while at the end of the process a little wedge at the upstream was observed. Nuntaphan and Kiatsiriroat [17] investigated the effect of fly ash deposit on the thermal performance of a cross flow heat exchanger having a set of spiral finned-tubes as a heat transfer surface [18,19]. The tubes of the heat exchanger tubes were vertically mounted in a staggered array, and the flow was horizontal.…”

Section: Introductionmentioning

confidence: 99%

Removal of gas-side particulate fouling layers by foreign particles as a function of flow direction

Abd-Elhady¹,

Abdelhady²,

Rindt³

et al. 2009

Applied Thermal Engineering

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“…For staggered arrangement, the effect of fin height was not significant on the pressure drop, because most of the pressure drop was caused by the staggered arrangement of the tubes. In the similar study in wet conditions Nuntaphan et al (2005b) found that the condensate resistance dominates over the effect of fin height on the heat transfer coefficient resulting in a negligible effect of the fin height on heat transfer coefficient, whereas the pressure drop increased with an increase in the fin height. For serrated fin, Naess (2010) observed that the heat transfer coefficient increases with an increase in the fin height (8.61 ≤ h f ≤ 11.38 mm), whereas the effect of fin height on the pressure drop was found to be negligible.…”

Section: Effect Of Fin Heightmentioning

confidence: 82%

“…Correlations for the Colburn factor and the friction factor were proposed for the inline and staggered arrangements. In a similar manner, Nuntaphan et al (2005b) investigated 10 samples of crimped spiral-finned-tube heat exchangers in the dehumidifying conditions. It was found that the heat transfer coefficient for a wet surface was lower as compared to the dry surface for Re < 2000.…”

Section: Side Viewmentioning

confidence: 99%

A review on the thermal hydraulic characteristics of the air-cooled heat exchangers in forced convection

Kumar

Joshi

Nayak

et al. 2015

Sadhana

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In this paper, a review is presented on the experimental investigations and the numerical simulations performed to analyze the thermal-hydraulic performance of the air-cooled heat exchangers. The air-cooled heat exchangers mostly consist of the finned-tube bundles. The primary role of the extended surfaces (fins) is to provide more heat transfer area to enhance the rate of heat transfer on the air side. The secondary role of the fins is to generate vortices, which help in enhancing the mixing and the heat transfer coefficient. In this study, the annular and plate fins are considered, the annular fins are further divided into four categories: (1) plane annular fins, (2) serrated fins, (3) crimped spiral fins, (4) perforated fins, and similarly for the plate fins, the fin types are: (1) plain plate fins, (2) wavy plate fins, (3) plate fins with DWP, and (4) slit and strip fins. In Section 4, the performance of the various types of fins is presented with respect to the parameters: (1) Reynolds number, (2) fin pitch, (3) fin height, (4) fin thickness, (5) tube diameter, (6) tube pitch, (7) tube type, (8) number of tube rows, and (9) effect of dehumidifying conditions. In Section 5, the conclusions and the recommendations for the future work have been given.

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Heat transfer and friction characteristics of crimped spiral finned heat exchangers with dehumidification

Cited by 49 publications

References 7 publications

Optimization of Flow Direction to Minimize Particulate Fouling of Heat Exchangers

Optimization of Flow Direction to Minimize Particulate Fouling of Heat Exchangers

Removal of gas-side particulate fouling layers by foreign particles as a function of flow direction

A review on the thermal hydraulic characteristics of the air-cooled heat exchangers in forced convection

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