Convective heat transfer to temperature dependent property fluids in the entry region of corrugated tubes

Rainieri, Sara; Pagliarini, G.

doi:10.1016/s0017-9310(02)00156-4

Cited by 125 publications

(36 citation statements)

References 7 publications

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“…Nu structured tube Nu smooth tube (17) Similarly, the pressure drop ratio f p is used to compare the rises of the pressure drops in both types of tubes:…”

Section: Heat Transfer and Pressure Drop Of The Structured Tubesmentioning

confidence: 99%

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Experimental and Numerical Investigation of the Pressure Drop and Heat Transfer Coefficient in Corrugated Tubes

et al. 2015

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Single-structured tubes (SSTs) and cross-structured tubes (CSTs) with helix-based structures are investigated with respect to their heat transfer properties and pressure drop based on the measurements of a non-isothermal gas flow inside the tubes. The examined Reynolds number range corresponds to relevant shell-andtube heat exchanger applications. After a detailed description of the measuring methods used, the test facilities and their validation-appropriate wall geometries with a high potential for heat transfer improvements are discussed. The experimental results show that the Nusselt number can be improved by varying the structure depth and angle of the helix, which can also influence the pressure drop in the tube. Numerical simulations demonstrate that the tangential velocity in the SSTs strongly varies with the structure angle, while the flow inside the CSTs only rotates locally.

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“…Nu structured tube Nu smooth tube (17) Similarly, the pressure drop ratio f p is used to compare the rises of the pressure drops in both types of tubes:…”

Section: Heat Transfer and Pressure Drop Of The Structured Tubesmentioning

confidence: 99%

“…The characteristics of deformed tubes in laminar and transitional flows were identified and compared to smooth tubes [17,18]. For low Reynolds numbers (e.g., Re < 3000), additional special tube structures were invented and researched [19,20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Pressure Drop and Heat Transfer Coefficient in Corrugated Tubes

et al. 2015

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“…The mechanism for improvement of the heat transfer performance in the passive method is by promoting turbulence near the tube wall surface to reduce the thermal boundary layer thickness. Another mechanism is based on intense fluid mixing by modified tubes such as finned tube, tube with rib, tube with spirally roughened wall, corrugated tube, fluted tube, helical tube, elliptical axis tube and microfin tube [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Among the modified tubes, the corrugated tube and the fluted tube have become important for heat transfer enhancement in turbulent single phase flow as the pressure drop increment is reasonable.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Rainieri and Pagliarini [18] studied the convective heat transfer and thermal performance behavior in corrugated tubes at different pitch ratios. Their results showed that the helical corrugation induced a significant swirl component.…”

Section: Literature Reviewmentioning

confidence: 99%

Double tube heat exchanger with novel enhancement: part II—single phase convective heat transfer

Tiruselvam¹,

Chin²,

Raghavan³

2012

Heat Mass Transfer

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The study is conducted to evaluate the heat transfer characteristics of two new and versatile enhancement configurations in a double tube heat exchanger annulus. The novelty is that they are usable in single phase forced convection, evaporation and condensation. Heat transfer coefficients are determined by the Wilson Plot technique in laminar and turbulent flow and correlations are proposed for Nusselt numbers. Comparisons are then made between heat transfer and flow friction.

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“…Based on the experimental data, Nusselt number and friction factor correlations are proposed for the periodically fully developed region. Rainieri and Pagliarini [32] studied the thermal performance of corrugated tubes in order to increase convective heat transfer. Tubes with helical corrugations and transverse corrugations with different pitch values were considered.…”

Section: Literature Reviewmentioning

confidence: 99%

Double tube heat exchanger with novel enhancement: part 3—convective condensation

Tiruselvam¹,

Chin²,

Raghavan³

2012

Heat Mass Transfer

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Two novel enhanced tubes, viz. Turbo-C with three dimensional surface corrugations and EXTEK with helical flutes, are evaluated in the present work. They are chosen for study because of their versatility for use in condensation as well as evaporation in a double tube heat exchanger assembly, typically as used in water source heat pumps. Average and local values of heat transfer coefficient and two-phase pressure drop are reported.

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Convective heat transfer to temperature dependent property fluids in the entry region of corrugated tubes

Cited by 125 publications

References 7 publications

Experimental and Numerical Investigation of the Pressure Drop and Heat Transfer Coefficient in Corrugated Tubes

Experimental and Numerical Investigation of the Pressure Drop and Heat Transfer Coefficient in Corrugated Tubes

Double tube heat exchanger with novel enhancement: part II—single phase convective heat transfer

Double tube heat exchanger with novel enhancement: part 3—convective condensation

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