Evaluation of a Locally Homogeneous Flow Model of Spray Evaporation

“…8 The simplest model used the common locally homogeneous flow (LHF) approximation, where the particles are assumed to act like tracer particles that instantly adopt the local gas velocity.…”

Section: Contentsmentioning

confidence: 99%

Predictions of the structure of turbulent, particle-laden round jets

1983

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M ODELS of dilute, particle-laden flows were evaluated using existing measurements in round jets. Three models were considered: 1) a locally homogeneous flow (LHF) model where velocity differences (slip) between the phases are neglected, 2) a deterministic separated flow (DSF) model where slip is considered but the effects of turbulent fluctuations on particle motion are ignored, and 3) a stochastic separated flow (SSF) model where random sampling is used to treat both slip and the effects of turbulent fluctuations. The LHF and DSF models over-and underestimated flow development rates. In contrast, the SSF model generally yielded good agreement with measurements-except at high particle loadings where the effects of turbulence modulation were observed. Data with full specification of initial conditions are needed, however, for more definitive model evaluation.

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“…(11) The parameters used in the calculation, step size, number of nodes, etc., were the same as in the earlier evaporating spray study. The various constants in the model were also unchanged from earlier work (9)(10)(11).…”

Section: Test Conditionsmentioning

confidence: 99%