Study of channel divergence on the flow and heat transfer in horizontal ducts heated from a side

Yang, Chyun-Yu; Liu, C. G.; Gau, Chie

doi:10.1016/j.ijthermalsci.2008.02.008

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Experimental studies on mixed convection in a divergent channel with a heated vertical sidewall with a 3° inclination from the other vertical sidewall were carried out by Yang et al [16]. The tall sidewalls had a height of 6.67 times the width of the channel.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Three-Dimensional Mixed Convection in a Horizontal Channel Using a Baffle

Chang

2015

Heat Transfer Engineering

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Three-dimensional mixed convection inside a horizontal rectangular channel with a square heated surface on one of the vertical sidewalls and an infinitely thin baffle installed on the opposite insulated sidewall is numerically investigated. Attention is focused on the influence of the baffle position (−2 to 2), the inclination angle between the baffle and the horizontal (15° to 90°), and the baffle height (0.2 to 0.9) on the flow and thermal characteristics. The other parameters remain unchanged: the Reynolds number (100), Grashof number (50 000) and Prandtl number (0.71). The results show recirculation around the top portion of the heated surface due to strong buoyancy. The heat transfer depends strongly on the relative positions of the baffle and the recirculation. Heat transfer enhancement is obtained with a higher baffle and a Downloaded by [North Dakota State University] at 12:06 18 February 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 larger inclination angle if the baffle is close to the cold main stream. In contrast, the average Nusselt number is slightly smaller if the baffle is surrounded by the recirculation than it is without the baffle. An accurate correlation is proposed for calculating the average Nusselt number over the investigated range of the baffle position and the inclination angle for a fixed baffle height (0.75).

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Section: Introductionmentioning

confidence: 99%

Enhanced Three-Dimensional Mixed Convection in a Horizontal Channel Using a Baffle

Chang

2015

Heat Transfer Engineering

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“…The average heat transfer results were correlated with an empirical correlation in terms of dependent parameters of Grashof, Prandtl, and Reynolds numbers. Yang et al [15] experimentally studied effects of the channel divergence on the flow and heat transfer in horizontal ducts with one of the side plates heated uniformly and opposite plate well insulated. They studied flow conditions for a range of Re from 316 to 1500, with buoyancy parameter Gr/Re 2 from 0 to 20,000 and Pr of the airflow 0.707.…”

Section: Introductionmentioning

confidence: 99%

Mixed Convection and Radiation Heat Transfer in a Horizontal Duct with Variable Wall Temperature

Ganesan

Narayanaswamy

Perumal

2014

Heat Transfer Engineering

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In this research, experiments are performed to study the laminar flow mixed-convection heat transfer with radiation effects for a hydrodynamically fully developed and thermally developing airflow in a horizontal duct. The duct cross section is made of two differentially heated isothermal vertical walls and two adiabatic horizontal walls with aspect ratios 1 and 0.5. The total heat transfer from the hot wall to the cold wall of the duct depends on the mixed convection and also on the surface radiation heat transfer that takes place within the duct. The analysis of experimental data for the Nusselt number from the hot wall of the duct shows that it is important to consider the effects of surface radiation, and to accounted for them, in the design and analysis of flow and heat transfer through ducts. The flow field within the duct is also made visible by a suitable smoke flow visualization method. The heated air moves upward, accumulates near the top wall adjacent to the hot wall of the duct, and gets circulated continuously to the cold wall on the opposite side. The accumulated flow is thermally stable; the stable conditions can reduce the heat transfer enhancement due to the buoyancy force. The results show that flow condition and surface radiation interaction significantly affect the total Nusselt number and the surface temperature variation along the walls.

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Effect of a diffuser on performance enhancement of a cylindrical methanol steam reformer by computational fluid dynamic analysis

Perng

Horng

2017

Applied Energy

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Study of channel divergence on the flow and heat transfer in horizontal ducts heated from a side

Cited by 7 publications

References 18 publications

Enhanced Three-Dimensional Mixed Convection in a Horizontal Channel Using a Baffle

Enhanced Three-Dimensional Mixed Convection in a Horizontal Channel Using a Baffle

Mixed Convection and Radiation Heat Transfer in a Horizontal Duct with Variable Wall Temperature

Effect of a diffuser on performance enhancement of a cylindrical methanol steam reformer by computational fluid dynamic analysis

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