On Variable-Property, Blowing, and Transient Effects in Convective Droplet Evaporation With Internal Circulation

Haywood, R. J.; Renksizbulut, Metin

doi:10.1615/ihtc8.1100

Cited by 11 publications

(5 citation statements)

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“…Specifically, vaporization acts to decrease drag by (i) thickening the boundary layer and thus reducing the shear stress at the droplet surface, and («) reducing the mixture viscosity in the gas phase boundary layer by increasing the concentration of cold fuel vapor. Following the methodology of Haywood and Renksizbulut (1986) the drag history can be predicted based on the drag correlation of Renksizbulut and Yuen (1983a) …”

Section: Fig 5 Nusselt and Sherwood Number Histories; O -Fully Numermentioning

confidence: 99%

A Detailed Examination of Gas and Liquid Phase Transient Processes in Convective Droplet Evaporation

Haywood

Nafziger

Renksizbulut

1989

Journal of Heat Transfer

117

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A finite volume numerical technique has been used to model the evaporation of an n-heptane droplet with an initial Reynolds number of 100 in air at 800 K, 1 atm. The effects of variable thermophysical properties, liquid phase motion and heating, and transient variations in droplet size and velocity are included in the analysis. With appropriate corrections for the effects of variable properties and liquid phase heating, quasi-steady correlations are shown to predict accurately the transient histories of the drag coefficient and Nusselt and Sherwood numbers. For the case investigated here, the transient effects of importance were the variation in droplet velocity, the decline in the liquid phase velocities, and the rise in the droplet surface and volume average temperatures. In spite of the transient rise in the droplet temperature, the nature of the liquid phase heating, as characterised by the liquid Nusselt number, was found to remain constant during most of the droplet lifetime.

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Section: Fig 5 Nusselt and Sherwood Number Histories; O -Fully Numermentioning

confidence: 99%

A Detailed Examination of Gas and Liquid Phase Transient Processes in Convective Droplet Evaporation

Haywood

Nafziger

Renksizbulut

1989

Journal of Heat Transfer

117

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“…Convection/diffusion is modeled using the central difference with deferred correction method [21], with the ''active'' coefficients calculated using the power-law scheme [2]. A staggered grid is adopted to avoid zigzag pressure distributions.…”

Section: Methodsmentioning

confidence: 99%

“…The constant properties in the liquid phase were evaluated at the average surface temperature of the droplet. Values for the fuel density and viscosity were calculated using the correlations given by Haywood [21]. The latent heat of vaporization for the fuel was determined using the method of Pitzer et al [13].…”

Section: Propertiesmentioning

confidence: 99%

A New Multicomponent Diffusion Formulation for the Finite-Volume Method: Application to Convective Droplet Combustion

Pope

Gogos²

2005

Numerical Heat Transfer, Part B: Fundamentals

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A new multicomponent formulation, appropriate for use with the finite-volume method, has been developed to describe mass diffusion velocities accurately. The new formulation is applied in a quasi-steady numerical model for n-heptane fuel droplet combustion in a forced-convection environment. Results obtained using the complete formulation are compared to the results obtained under various assumptions. Using a single binary diffusion coefficient produces results for extinction velocity, maximum temperature, flame dimensions, evaporation constant, and drag coefficient that are significantly different from the results obtained using the complete formulation. Neglecting thermal diffusion (Soret effect) causes only minor changes (less than 2%).

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“…Six correlations of C D available are provided in Table 4 [13,19,[28][29][30][31]. Table 3 Mixing laws of properties…”

Section: Droplet Motionmentioning

confidence: 99%

Comparative Investigation on Droplet Evaporation Models for Modeling Spray in Cross-Flow

Sun

Bai

Zhang

2013

Heat Transfer Engineering

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The coupling model of flow and heat and mass transfer for gas-spray droplet two-phase flow has been developed to simulate the evaporating spray in cross-flow. The correlations used for describing the droplet evaporation and motion in convective flow have been compared. The comparisons of calculated results show that the different correlations for determining Nusselt number and Sherwood number impose a significant influence on the lifetime of droplet. The modification of Nusselt number and Sherwood number with regard to the heat and mass boundary around the droplet is of great importance, while different mixing laws for mixture properties and different drag coefficient equations only demonstrate a slight effect on the evaporation characteristics of droplet. The characteristics of spray droplets and cross-flow in terms of both evaporation and motion are obtained. The secondary flow phenomenon is observed in the simulation results and contributes to achieving a more even distribution of temperature and an improved mixing effect of the vapor and cross-flow.

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On Variable-Property, Blowing, and Transient Effects in Convective Droplet Evaporation With Internal Circulation

Cited by 11 publications

References 0 publications

A Detailed Examination of Gas and Liquid Phase Transient Processes in Convective Droplet Evaporation

A Detailed Examination of Gas and Liquid Phase Transient Processes in Convective Droplet Evaporation

A New Multicomponent Diffusion Formulation for the Finite-Volume Method: Application to Convective Droplet Combustion

Comparative Investigation on Droplet Evaporation Models for Modeling Spray in Cross-Flow

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