Augmentation of convective heat transfer by an effective utilization of droplet inertia

Koichi Hishida; Tatsuto Nagayasu; Masanobu Maeda

doi:10.1016/0017-9310(94)00308-I

Augmentation of convective heat transfer by an effective utilization of droplet inertia

Koichi Hishida, Tatsuto Nagayasu, Masanobu Maeda

Department of System Design Engineering

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

Flow characteristics and heat transfer of a water droplets laden flow behind a backward-facing step have been experimentally and numerically investigated for the condition of isothermally heated dry wall. Two sizes of step heights were employed corresponding to Re_H = 5.3 × 10³, 1.1 × 10⁴. Numerical simulations were performed by a standard κ-ε model for the gas phase and a Lagrangian stochastic model for the trajectories of droplets. The experimental and numerical results showed that large heat transfer enhancement existed downstream of the reattachment region and was correlated well with the ratio of time scale between an appropriate time scale of the turbulent flow and the relaxation time of droplet.

Original language	English
Pages (from-to)	1773-1785
Number of pages	13
Journal	International Journal of Heat and Mass Transfer
Volume	38
Issue number	10
DOIs	https://doi.org/10.1016/0017-9310(94)00308-I
Publication status	Published - 1995 Jul

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/0017-9310(94)00308-I

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abstract = "Flow characteristics and heat transfer of a water droplets laden flow behind a backward-facing step have been experimentally and numerically investigated for the condition of isothermally heated dry wall. Two sizes of step heights were employed corresponding to ReH = 5.3 × 103, 1.1 × 104. Numerical simulations were performed by a standard κ-ε model for the gas phase and a Lagrangian stochastic model for the trajectories of droplets. The experimental and numerical results showed that large heat transfer enhancement existed downstream of the reattachment region and was correlated well with the ratio of time scale between an appropriate time scale of the turbulent flow and the relaxation time of droplet.",

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AU - Hishida, Koichi

AU - Nagayasu, Tatsuto

AU - Maeda, Masanobu

PY - 1995/7

Y1 - 1995/7

N2 - Flow characteristics and heat transfer of a water droplets laden flow behind a backward-facing step have been experimentally and numerically investigated for the condition of isothermally heated dry wall. Two sizes of step heights were employed corresponding to ReH = 5.3 × 103, 1.1 × 104. Numerical simulations were performed by a standard κ-ε model for the gas phase and a Lagrangian stochastic model for the trajectories of droplets. The experimental and numerical results showed that large heat transfer enhancement existed downstream of the reattachment region and was correlated well with the ratio of time scale between an appropriate time scale of the turbulent flow and the relaxation time of droplet.

AB - Flow characteristics and heat transfer of a water droplets laden flow behind a backward-facing step have been experimentally and numerically investigated for the condition of isothermally heated dry wall. Two sizes of step heights were employed corresponding to ReH = 5.3 × 103, 1.1 × 104. Numerical simulations were performed by a standard κ-ε model for the gas phase and a Lagrangian stochastic model for the trajectories of droplets. The experimental and numerical results showed that large heat transfer enhancement existed downstream of the reattachment region and was correlated well with the ratio of time scale between an appropriate time scale of the turbulent flow and the relaxation time of droplet.

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JO - International Journal of Heat and Mass Transfer

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ER -

Augmentation of convective heat transfer by an effective utilization of droplet inertia

Abstract

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