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Pressure drop and thermal performance in rotating two-pass ducts with various cross rib arrangements

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Abstract

The present study investigates the pressure drop characteristics of rotating two-pass ducts. The duct has an aspect ratio (W/H) of 0.5 and a hydraulic diameter (D h ) of 26.67 mm. Rib turbulators are attached in the four different cross arrangements on the leading and trailing surfaces of the test ducts. The ribs have a rectangular cross section of 2 mm (e) × 3 mm (w) and a rib angle-of-attack of 70°. The pitch-to-rib-height ratio (p/e) is 7.5 and the rib-height-to-hydraulic-diameter ratio (e/D h ) is 0.075. The measured results for each region show that the highest pressure drop appears in the turning region in the stationary case, but appears in the upstream region of the second pass in the rotating case. The heat transfer and the pressure coefficients in the first pass are similar for the stationary and rotating cases in all the tested rib arrangements. After the turning region, however, the heat transfer and pressure drop are high in the cases with the cross NN- and PP-type ribs in the stationary ducts. In the rotating ducts, they are high in the cases with the cross NP- and PP-type ribs.

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Abbreviations

C p :

non-dimensional pressure drop coefficient, Eq. (1)

D h :

duct hydraulic diameter (m)

D naph :

mass diffusion coefficient of naphthalene vapor in air (m2 s−1)

e :

rib height (m)

f :

friction factor, Eq. (2)

f 0 :

friction factor of a fully developed turbulent flow in a stationary smooth pipe

h m :

mass transfer coefficient (m s−1)

H :

passage height (m)

p :

rib-to-rib pitch

P ref :

reference pressure

P x :

local pressure

Re :

Reynolds number, D h u b /ν

Ro :

Rotation number, D h Ω/u b

Sh :

Sherwood number, h m D h /D naph

Sh 0 :

Sherwood number of a fully developed turbulent flow in a smooth pipe

\( \overline{{Sh}} \) :

regional averaged Sherwood number

u b :

mean flow velocity (m s−1)

w :

width of the rib (m)

W :

width of the passage (m)

x :

streamwise distance from the rotating axis

y :

lateral distance from the center of channel

z :

distance from the center toward vertical direction

α :

rib angle-of-attack

η :

thermal performance, Eq. (3)

μ :

dynamic viscosity

ν :

kinematic viscosity

ρ :

density of the fluid

Ω :

angular velocity

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Acknowledgments

This work was supported partially by the Electric Power Industry Technology Evaluation and Planning.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Yonsei University, Seoul, 120-749, South Korea

    Kyung Min Kim, Dong Hyun Lee & Hyung Hee Cho

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  1. Kyung Min Kim
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  2. Dong Hyun Lee
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  3. Hyung Hee Cho
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Correspondence to Hyung Hee Cho.

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Kim, K.M., Lee, D.H. & Cho, H.H. Pressure drop and thermal performance in rotating two-pass ducts with various cross rib arrangements. Heat Mass Transfer 44, 913–919 (2008). https://doi.org/10.1007/s00231-007-0331-y

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  • DOI: https://doi.org/10.1007/s00231-007-0331-y

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