Experimental study of thermal behaviors in a rectangular channel with baffle of pores

Lin, Chu-Wei

doi:10.1016/j.icheatmasstransfer.2006.04.008

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…Flow over a backward-facing step (BFS) has been the subject of numerous investigations due to its wide range of applications in engineering such as cooling techniques or heat transfer of electronic devices (3) . As an important example spatial-temporal velocity fields of flow through an axisymmetric sudden expansion were experimentally investigated over a range of Reynolds numbers (4,5,6,7,8) .…”

Section: Introductionmentioning

confidence: 99%

UVP Measurement of Flow around a Baffle in a Rectangular Open Channel

Jamshidnia

Takeda

2009

JFST

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The effect of an intermediate standing baffle on the structure of flow in a rectangular open channel has been successfully captured by an Ultrasonic Velocity Profiler (UVP). Various spatial distributions such as on-axis time-averaged velocity profiles and turbulent intensities at different streamwise positions indicate the flow structure of the uprising flow at the upstream of baffle, vortex shedding and flow separation, change of the effective cross-section at immediate downstream of the baffle and recirculation flow at the downstream of the baffle. These phenomena are also reflected in the peak values of the relative turbulent intensity profiles. Space-Time on-axis velocity color-map of upstream and downstream sections confirms the existence of periodic change of flow direction near the edge of the baffle at downstream sections. The captured phenomena were also categorized by observing four types of Phenomenological Zero Crossing Points (PCP).Comparison of space-dependent power spectra of upstream and downstream sections of the baffle indicates the existence of some peak structures concentrated near the edge of the baffle for downstream sections whereas such peak structures have not been observed for the downstream sections. Also for downstream sections mainly the existence of peak values in the space distribution of two frequency modes could be confirmed which can be attributed to the vortex shedding due to the existence of the baffle.

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Section: Introductionmentioning

confidence: 99%

UVP Measurement of Flow around a Baffle in a Rectangular Open Channel

Jamshidnia

Takeda

2009

JFST

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“…The overall performance of the tested baffled wall showed an increase in the Nusselt number and friction factor induced by the baffles with respect to a smooth channel under similar flow conditions. Lin 16 experimentally investigated the local heat transfer in rectangular channel with baffles and analysed the experimental results of heat transfer for baffle designed with different heights and pores in the event of five Reynolds numbers and three heating quantities. Nasiruddin and Siddiqui 17 investigated a significant Nusselt number in a heat exchanger tube by attaching a baffle into flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of effect of flow attack angle on thermohydraulic performance of air flow in a rectangular channel with discrete V-pattern baffle on the heated plate

Kumar

Chauhan

Sethi

et al. 2016

Advances in Mechanical Engineering

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In this work, the effect of angle of attack (a a ) of the discrete V-pattern baffle on thermohydraulic performance of rectangular channel has been studied experimentally. The baffle wall was constantly heated and the other three walls of the channel were kept insulated. The experimentations were conducted to collect the data on Nusselt number (Nu b ) and friction factor (f b ) by varying the Reynolds number (Re) = 3000-21,000 and angle of attack (a a ) from 30°to 70°, for the kept values of relative baffle height (H b =H) = 0:50, relative pitch ratio (P b =H) = 1:0, relative discrete width (g w =H b ) = 1:5 and relative discrete distance (D d =L v ) = 0:67. As compared to the smooth wall, the V-pattern baffle roughened channel enhances the Nusselt number (Nu b ) and friction factor (f b ) by 4.2 and 5.9 times, respectively. The present discrete V-pattern baffle shapes with angle of attack (a a ) of 60°equivalent to flow Reynolds number of 3000 yields the greatest thermohydraulic performance. Discrete V-pattern baffle has improved thermal performance as compared to other baffle shapes' rectangular channel.

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“…Three height values with the same step width were considered, The results revealed that the increase of the height of the step induces an increase of the length of attachment and the Nusselt number but also to a crossing of the friction coefficient. The experimental study of Chu-Wei (2006) tries to explore the local heat transfer in a rectangular channel in the presence of the baffles. In order to obtain an optimized deflector and increase the flow field disturbance, the analysis of effect of five baffles heights (H = 10 to 50 mm) and three different numbers of pores (N = 1-3) was carried out.…”

Section: Introductionmentioning

confidence: 99%

Convective Thermal Analysis of a Turbulent Flow in a Pipe with Two and Three Corrugated Baffles Arranged in Overlap

Benzenine¹,

Saïm²,

Abboudi³

et al. 2016

AJHMT

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The present work is a numerical computation of steady turbulent forced convection flow and pressure drop characteristics in a two-dimensional horizontal rectangular cross section channel with isothermal walls and with two and three transverse waved baffles disposed overlapping in a channel. The fluid is considered as Newtonian, incompressible with constant properties. The governing equations are solved by the method of finite volume using the SIMPLE-algorithm, in two-dimensions with the k-ε Realizable model to describe the turbulence phenomena. Air is the working fluid with the flow rate in terms of Reynolds numbers ranging from 5.000 to 20.000. The effects of baffle shape geometries as well as Reynolds numbers on the flow patterns and heat transfer performances are investigated. To understand the characteristics of thermal enhancements, the friction factors are also computed. The numerical results are validated with available flat rectangular-shaped baffle measured data and found to agree well with measurement. The computational results reveal essentially, that the shape of the baffles can alter substantially the flow and heat transfer characteristics. In general, an increase in the flow Reynolds number causes a substantial increase in the convective Nusselt number other than the pressure loss is also very important. The detailed knowledge on the flow and heat transfer distribution in this computation provides the basis for further optimization of shell-and-tube heat exchangers.

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Experimental study of thermal behaviors in a rectangular channel with baffle of pores

Cited by 18 publications

References 8 publications

UVP Measurement of Flow around a Baffle in a Rectangular Open Channel

UVP Measurement of Flow around a Baffle in a Rectangular Open Channel

Experimental investigation of effect of flow attack angle on thermohydraulic performance of air flow in a rectangular channel with discrete V-pattern baffle on the heated plate

Convective Thermal Analysis of a Turbulent Flow in a Pipe with Two and Three Corrugated Baffles Arranged in Overlap

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