Single-phase heat transfer and pressure drop of the cooling of water inside smooth tubes for transitional flow with different inlet geometries (RP-1280).(Report): An article from: HVAC & R Research
Book Details
Author(s)J.A. Olivier, J.P. Meyer
PublisherTaylor & Francis Ltd.
ISBN / ASINB00411E2XA
ISBN-13978B00411E2X2
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from HVAC & R Research, published by Taylor & Francis Ltd. on July 1, 2010. The length of the article is 10132 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: Design constraints and energy requirements have often led to heat exchangers operating outside of their design parameters. These parameters often involve the exchanger operating in the transition region of flow. Adiabatic as well as diabatic experiments were conducted inside smooth tubes with diameters of 15.88 mm (5/8 in.) and 19.02 mm (3/4 in.). Four inlet profiles were investigated; hydrodynamically fully developed, square-edged, re-entrant, and bellmouth. The test fluid was water that was cooled, with Reynolds numbers ranging between 1000 and 20,000, Prandtl numbers between 4 and 6, and Grashof numbers in the order of [10.sup.5]. Adiabatic results showed that transition from laminar to turbulent flow was strongly dependent on the inlet profile, with transition being delayed to Reynolds numbers as high as 12,000, confirming results of previous studies. Diabatic heat transfer and friction factor results showed that transition was independent of the inlet, with transition occurring at a Reynolds number of approximately 2100. This was due to the secondary flow suppressing the disturbance of the inlets. Laminar heat transfer and friction factors were also substantially higher than when compared with their theoretical counterparts. This could also be attributed to secondary flows, confirming previously published results. A direct relationship between friction factor and heat transfer exists and is shown to predict 88% of the friction factor data to within 15%, with a mean absolute error of 8.7% when using well-known laminar and turbulent heat transfer correlations.
Citation Details
Title: Single-phase heat transfer and pressure drop of the cooling of water inside smooth tubes for transitional flow with different inlet geometries (RP-1280).(Report)
Author: J.A. Olivier
Publication:HVAC & R Research (Magazine/Journal)
Date: July 1, 2010
Publisher: Taylor & Francis Ltd.
Volume: 16 Issue: 4 Page: 471(26)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: Design constraints and energy requirements have often led to heat exchangers operating outside of their design parameters. These parameters often involve the exchanger operating in the transition region of flow. Adiabatic as well as diabatic experiments were conducted inside smooth tubes with diameters of 15.88 mm (5/8 in.) and 19.02 mm (3/4 in.). Four inlet profiles were investigated; hydrodynamically fully developed, square-edged, re-entrant, and bellmouth. The test fluid was water that was cooled, with Reynolds numbers ranging between 1000 and 20,000, Prandtl numbers between 4 and 6, and Grashof numbers in the order of [10.sup.5]. Adiabatic results showed that transition from laminar to turbulent flow was strongly dependent on the inlet profile, with transition being delayed to Reynolds numbers as high as 12,000, confirming results of previous studies. Diabatic heat transfer and friction factor results showed that transition was independent of the inlet, with transition occurring at a Reynolds number of approximately 2100. This was due to the secondary flow suppressing the disturbance of the inlets. Laminar heat transfer and friction factors were also substantially higher than when compared with their theoretical counterparts. This could also be attributed to secondary flows, confirming previously published results. A direct relationship between friction factor and heat transfer exists and is shown to predict 88% of the friction factor data to within 15%, with a mean absolute error of 8.7% when using well-known laminar and turbulent heat transfer correlations.
Citation Details
Title: Single-phase heat transfer and pressure drop of the cooling of water inside smooth tubes for transitional flow with different inlet geometries (RP-1280).(Report)
Author: J.A. Olivier
Publication:HVAC & R Research (Magazine/Journal)
Date: July 1, 2010
Publisher: Taylor & Francis Ltd.
Volume: 16 Issue: 4 Page: 471(26)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
