Glossary · Slurry flow

Cvd Deposition Velocity

Also known as deposition limit velocity (Vs). Threshold flow velocity that describes the minimum velocity needed to prevent solids from forming a stationary bed for a particular solids concentration (Cvd).

This characteristic velocity is derived from the maximum deposition limit velocity (Vsm) using the Wilson 1986 model for relative solids volumetric concentration – Vs – Vsm relationship.

Formula: 
Vₛ/Vₛₘ = 6.75Cᵣᵅ(1 − Cᵣᵅ)²                     Cᵣₘ ≤ 0.33
Vₛ/Vₛₘ = 6.75Cᵣ(1 − Cᵣ)²ᵝ[1 − (1 − Cᵣ)²ᵝ]      Cᵣₘ > 0.33

α = ln0.33333 / lnCᵣₘ
β = ln0.6667 / ln(1 − Cᵣₘ)
Cᵣₘ = 0.16D⁰·⁴ / dₘₘ⁰·⁸⁴[μₛ((Sₛ − S𝒻)/0.66S𝒻)]⁰·¹⁶⁵
Cᵣ = Cᵥd / Cᵥb

Where:

C_{vb}	Volumetric solids concentration in loose-poured bed
C_{vd}	Delivered volumetric solids concentration
S_s	Relative density of slurry solids
S_s	Relative density of carrier fluid
V S V_{S}VS	C_{vd} Deposition Velocity / Deposition Limit Velocity
V_{SM}	Deposition Velocity / Maximum Deposition Limit Velocity
\mu_s	Pipe diameter

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