Local heat transfer distribution in a square channel with 90° continuous, 90° saw tooth profiled and 60° broken ribs

Gupta, Abhishek; SriHarsha, V.; Prabhu, S.V.; Vedula, Rajendra P.

doi:10.1016/j.expthermflusci.2007.11.015

Cited by 52 publications

(20 citation statements)

References 11 publications

(21 reference statements)

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“…The heated-thin-foil sensor to determine local heat transfer distributions is used also by Gupta et al (2008) in a double wall ribbed square channel for several configurations and by varying the pitch to rib height ratio (P/e) and the rib height to hydraulic diameter ratio (e/D). Reynolds number based on D ranges from 10,000 to 30,000.…”

Section: °Turn Channels and Ribsmentioning

confidence: 99%

Infrared thermography for convective heat transfer measurements

2010

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This paper deals with the evolution of infrared (IR) thermography into a powerful optical tool that can be used in complex fluid flows to either evaluate wall convective heat fluxes or investigate the surface flow field behavior. Measurement of convective heat fluxes must be performed by means of a thermal sensor, where temperatures have to be measured with proper transducers. By correctly choosing the thermal sensor, IR thermography can be successfully exploited to resolve convective heat flux distributions with both steady and transient techniques. When comparing it to standard transducers, the IR camera appears very valuable because it is non-intrusive, it has a high sensitivity (down to 20 mK), it has a low response time (down to 20 ls), it is fully two dimensional (from 80 k up to 1 M pixels, at 50 Hz) and, therefore, it allows for better evaluation of errors due to tangential conduction within the sensor. This paper analyses the capability of IR thermography to perform convective heat transfer measurements and surface visualizations in complex fluid flows. In particular, it includes the following: the necessary radiation theory background, a review of the main IR camera features, a description of the pertinent heat flux sensors, an analysis of the IR image processing methods and a report on some applications to complex fluid flows, ranging from natural convection to hypersonic regime.

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Section: °Turn Channels and Ribsmentioning

confidence: 99%

Infrared thermography for convective heat transfer measurements

2010

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“…Result showed that for low aspect ratio channels heat transfer does not change significantly whereas the high aspect ratio ducts show higher heat transfer for asymmetric heating condition than that of symmetric heating. Gupta et al [5] used IRT technique to study the heat transfer distribution in a single pass square duct with different rib configurations (90°continuous, 90°saw tooth profiled, 60°V-broken). They also considered different pitch-to-rib height (p/e) ratios for a fixed value of rib height to hydraulic diameter ratio (e/D h ).…”

Section: Experimental Studiesmentioning

confidence: 99%

Influence of turn geometry on turbulent fluid flow and heat transfer in a stationary two-pass square duct

Erelli

Saha

Panigrahi

2015

International Journal of Heat and Mass Transfer

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“…Skullong and Promvonge [16] investigated the heat transfer and flow friction characteristics in a solar air heater channel fitted with delta-winglet type vortex generators. Sri Harsha et al [17] and Gupta et al [18] studied the local heat transfer distribution and pressure drop in a square channel and found that the 60° V-broken rib gives the heat transfer higher than the 90° continuous and profiled ones. Tanda [19] investigated the effect of transverse, angled ribs, discrete, angled discrete ribs, V-shaped, V-shaped broken and parallel broken ribs on heat transfer and flow friction.…”

Section: Introductionmentioning

confidence: 98%