Augmentation of laminar flow and heat transfer in flat tubes by means of helical screw-tape inserts

Ibrahim, El-Nobi A.

doi:10.1016/j.enconman.2010.06.065

Cited by 102 publications

(17 citation statements)

References 18 publications

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“…Bhuiya et al [17] experimentally studied the heat transfer enhancement and developed new correlations for turbulent flow through a tube with triple helical tape inserts. Ibrahim [18] investigated the heat transfer and fluid friction characteristics in horizontal double pipe flat tubes with full legth helical screw inserts of different twist ratio and helical screw inserts of different spacer length.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer performance for turbulent flow through a tube using double helical tape inserts

Bhuiya

Chowdhury

Ahamed

et al. 2012

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Heat transfer performance for turbulent flow through a tube using double helical tape inserts

Bhuiya

Chowdhury

Ahamed

et al. 2012

International Communications in Heat and Mass Transfer

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“…However the presence of the wire coil showed a more positive effect on Newtonian fluid than in non-Newtonian ones, advancing the transition to turbulence. Ibrahim [7] investigated heat transfer and friction factor characteristics of laminar flow through flat shell and tube type arrangement having helical screw tape insert ( Figure 7 and Figure 8) with different twist ratios (2.17, 3.33, 4.3, and 5) and different spacer length (100 mm, 200 mm, 300 mm, and 400 mm). Cold and hot water were used as working fluids in tube side and shell side, respectively.…”

Section: Pertinent Research Workmentioning

confidence: 99%

Single Phase Laminar Flow Heat Transfer Enhancement A Review: (a) Combined Transverse Ribs and Twisted Tapes and (b) Combined Helical Screw Tape Inserts and Wire Coil Inserts

2016

2016 International Conference on Advances in Software, Control and Mechanical Engineering (ICSCME-16) April 12-13, 2016 Kyoto (

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Passive heat transfer enhancement is the most widely adopted technique in industries due to low implementation cost. This paper presents state of the art reviews of two very popular passive techniques namely, wall roughness (ribs and wire coils) and swirl generators (twisted tapes and helical screw tapes). This paper concludes that ribbed surfaces and wire coils have potential to improve the performance of heat exchangers at low pumping power penalty and when coupled with twisted tapes/helical screw tapes, more compact and high performance heat exchangers may be developed with considerable saving of materials and energy.

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“…The solution heat transfer coefficient was calculated with Equation (14) for SP [21]. The solution and water cooling (h C ) heat transfer coefficients were calculated with Equation (15) for HM [22]. The water cooling heat transfer coefficient (h C ) always use an HM in this study.…”

Section: Empirical Correlationsmentioning

confidence: 99%

A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer

et al. 2017

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Abstract:The heat transfer in double pipe heat exchangers is very poor. This complicates its application in absorption cooling systems, however, the implementation of simple passive techniques should help to increase the heat and mass transfer mainly in the absorber. This paper carried out a simulation and its experimental comparison of a NH 3 -H 2 O bubble absorption process using a double tube heat exchanger with a helical screw static mixer in both central and annular sides. The experimental results showed that the absorption heat load per area is 31.61% higher with the helical screw mixer than the smooth tube. The theoretical and experimental comparison showed that the absorption heat load difference values were 28.0 and 21.9% for smooth tube and the helical mixer, respectively. These difference values were caused by the calculation of the log mean temperature difference in equilibrium conditions to avoid the overlap of solution temperatures. Therefore, the theoretical and experimental results should be improved when the absorption heat is included in the heat transfer equation or avoiding the operation condition when output is lower than input solution temperature.

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Augmentation of laminar flow and heat transfer in flat tubes by means of helical screw-tape inserts

Cited by 102 publications

References 18 publications

Heat transfer performance for turbulent flow through a tube using double helical tape inserts

Heat transfer performance for turbulent flow through a tube using double helical tape inserts

Single Phase Laminar Flow Heat Transfer Enhancement A Review: (a) Combined Transverse Ribs and Twisted Tapes and (b) Combined Helical Screw Tape Inserts and Wire Coil Inserts

A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer

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