Heat transfer distribution for three interacting methane–air premixed impinging flame jets

Hindasageri, Vijaykumar; Vedula, Rajendra P.; Prabhu, S.V.

doi:10.1016/j.ijheatmasstransfer.2015.04.098

Cited by 26 publications

(3 citation statements)

References 36 publications

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“…For the short interval of time and by fluctuating the heat flux (q"), for different time intervals, the noted temperature T(z,t) is then matched with an Eq. (4), such that the square root of the sum of squares, RSS=√∑ ( − ) 2 =1 is minimum [18,[27][28][29].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…It is also seen that there is no information available in the literature using twisted tape as a swirler to study the swirling flame jet heat transfer characteristics of IDF. In the present work, the distribution of the heat fluxes on an impingement plate are studied by the novel method of inverse heat conduction problem (IHCP) in a semi-infinite medium using a thermal infrared camera [27][28][29]. The heat flux distribution is presented for the air jet Reynolds number (Rea) = 1000 to 2500 and burner to impingement plate distance (H/da) = 2 to 20 for a constant equivalence ratio (ϕ) of 1.1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat Transfer Characteristics of a Coaxial Inverse Diffusion Flame Jet Impingement with an Induced Swirl

Badiger¹,

Katti²,

Tumkur³

2020

IJHT

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Flame jet has a wide range of applications in the industries and also in domestics field. The efforts have been put to enhance the heat transfer and to reduce the emissions from the premixed and inverse diffusion flame burners. Especially, the IDF burner suffers from lack of proper air and fuel mixing, the swirl generated motion from twisted tape would improve the combustion efficiency. Therefore, an aim of experiment is to study the heat transfer characteristics of an inverse diffusion flame (IDF) jet impinging on a flat surface in a coaxial tube burner with swirl. The twisted tape of 15mm pitch creates the swirl in the flame jet (Corresponding to the twist ratio of 3 and swirl number of 0.52). An effect of swirl at air jet Reynolds number of 1000 to 2500 and surface of the burner-to-impingement plate distance (H/da) varying from 2 to 20 is studied at fixed equivalence ratio (ϕ) of 1.1. An average heat flux and peak heat flux are studied for the region of 0<r/da<3 on an impingement plate. From an investigation, it is found that the swirling in the flame jet enhances the average heat flux by up to 179.2%. The maximum average heat flux is found at the optimal burner-to-target plate distance of 8.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of a Coaxial Inverse Diffusion Flame Jet Impingement with an Induced Swirl

Badiger¹,

Katti²,

Tumkur³

2020

IJHT

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“…A specific explanation to this observation would require an in-depth analysis of the heat flux distribution for the experimental conditions of this study, which is not in scope for this specific work. In fact, it is commonly accepted in literature that the heat flux distribution for specific flame jet impingement problems is dependent on the complex interplay of a number of factors: nozzle-substrate spacing [39], Reynolds number, burner shape, equivalence ratio, oxygen enhancement [40], flame impingement angle [41] and interjets spacing (for multi-jet arrangements as in this study) [42,43]. The nozzle array configuration of this study, composed of a circular array of 15 burners, placed around an internal stream of powder-carrying Ar and surrounded by a circular array of ambient-temperature compressed air represents a complex interaction problem between jets of different temperatures, Reynolds number and chemical compositions, for which a simple analytical solution is non-trivial.…”

Section: Validation Of Flame Characterisation Approachmentioning

confidence: 99%

Transient three-dimensional geometrical/thermal modelling of thermal spray: Normal-impinging jet and single straight deposits

Fanicchia

Axinte

2018

International Journal of Heat and Mass Transfer

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A new time-dependent approach to the geometrical and thermal modelling of the deposit footprint in thermal spray processes is proposed. Based upon a three-dimensional finite-difference numerical technique, the model is composed of two integrated sections: a geometrical analysis, accounting for deposit geometry analytical prediction, and a thermal analysis that computes the system temperature history. Primary process factors for the simulation, i.e. plume distribution parameters, jet heat transfer properties and temperature-dependent deposition efficiency are determined in a preliminary stage of model application. Through computation of the simulated impact surface temperature at each instant during the simulation, the deposition efficiency-mediated growth of the deposit is accurately predicted at arbitrary values of torch feed speed. The model is flexible as it only relies on an initial calibration stage performed at a specific set of process parameters to be able to predict deposition geometries at arbitrary conditions, thus avoiding the need of complex simulations and/or knowledge of single splats impact properties. Moreover, this modelling approach has the potential to be extended to several thermal spray processes at arbitrary values of process parameters (e.g. torch design, materials, etc.), opening the way for spray automation in difficult-to-spray geometries and/or repair applications. The proposed modelling framework has been validated on Combustion Flame Spray (CFS) deposition of CoNiCrAlY alloy on stainless steel substrates, yielding low errors (< 5% on average) in predicting the deposit footprint at various torch feed speeds.

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Inverse Heat Conduction Problems

Sawaf¹

2023

Inverse Heat Conduction

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Heat transfer distribution for three interacting methane–air premixed impinging flame jets

Cited by 26 publications

References 36 publications

Heat Transfer Characteristics of a Coaxial Inverse Diffusion Flame Jet Impingement with an Induced Swirl

Heat Transfer Characteristics of a Coaxial Inverse Diffusion Flame Jet Impingement with an Induced Swirl

Transient three-dimensional geometrical/thermal modelling of thermal spray: Normal-impinging jet and single straight deposits

Inverse Heat Conduction Problems

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