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Mechanics of submerged jet cavitating action: material properties, exposure time and temperature effects on erosion

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Abstract

Experimental setup with a submerged cavitating jet has been used for the study of influences of material, exposure time and working fluid temperature on the erosion process. Each of the parameters has been varied separately, and the results of erosion are analyzed in detail. Additionally, comparison of experiments with nitrated and non-nitrated material has been made in order to study the enhancement (mostly reflected as the prolonged incubation time) of erosion resistance achieved by nitrating the specimen surface.

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Abbreviations

σ :

cavitation number—defined as \(\sigma =\frac{p_{\rm ref} - p_{v}}{\frac{1}{2}\rho \times u^{2}_{\rm ref}}\)

p ref :

reference (downstream) pressure (bar)

p v (T):

saturation (vapour) pressure (bar)

ρ L (T):

density of the liquid (kg/m3)

T :

temperature (°C)

L :

stand-off distance (mm)

A :

nozzle outlet cross-section area (m2)

D in :

inlet nozzle diameter (mm)

u ref :

reference velocity − exit jet velocity (m/s) = Q/A = V j

p 1 :

upstream pressure (bar) (absolute)

p 2 :

downstream pressure (bar) (absolute)

ΔW :

weight loss (mg),

ρ m :

density of the eroding material (kg/m3),

Δt :

exposure time (h, s)

Q :

K ×  √ (p 1−p 2) flow rate (m3/s)

K :

constant = 4.78E-09 for divergent; (m3/s/Pa1/2) = 6.17E-09 for convergent nozzle

D out :

outlet nozzle diameter (mm)

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

    Ezddin Ali Farag Hutli & Milos S. Nedeljkovic

  2. Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

    Nenad A. Radovic

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  1. Ezddin Ali Farag Hutli
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  2. Milos S. Nedeljkovic
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  3. Nenad A. Radovic
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Correspondence to Milos S. Nedeljkovic.

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Hutli, E.A.F., Nedeljkovic, M.S. & Radovic, N.A. Mechanics of submerged jet cavitating action: material properties, exposure time and temperature effects on erosion. Arch Appl Mech 78, 329–341 (2008). https://doi.org/10.1007/s00419-007-0163-8

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  • DOI: https://doi.org/10.1007/s00419-007-0163-8

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