Search
- Filter Results
- Location
- Classification
- Include attachments
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/08%3A_Usage_of_the_DHLLDV_Framework/8.10%3A_The_Resulting_Erhg_Constant_Spatial_Volumetric_Concentration_CurveThe particle diameter to pipe diameter ratio d/ D p <r d/Dp /2, equation (8.9-5): At line speeds above the intersection line speed of the sliding bed regime (SB) and the heterogeneous regime (He), the...The particle diameter to pipe diameter ratio d/ D p <r d/Dp /2, equation (8.9-5): At line speeds above the intersection line speed of the sliding bed regime (SB) and the heterogeneous regime (He), the He-Ho curve is valid otherwise the FB-SB curve is valid.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/09%3A_Comparison_of_the_DHLLDV_Framework_with_Other_Models/9.01%3A_IntroductionWith the knowledge that the ELM often used for the homogeneous regime and most models for the heterogeneous regime are proportional or close to proportional to both the volumetric concentration and th...With the knowledge that the ELM often used for the homogeneous regime and most models for the heterogeneous regime are proportional or close to proportional to both the volumetric concentration and the relative submerged density, the conclusion can be drawn that the intersection point of these two regimes (the transition velocity) is almost independent of the volumetric concentration and the relative submerged density.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/07%3A_The_Delft_Head_Loss_and_Limit_Deposit_Velocity_Framework/7.04%3A_A_Head_Loss_Model_for_Sliding_Bed_Slurry_Transport\[\ \begin{array}{left} \mathrm{F}_{\mathrm{n}} &=\mathrm{2} \cdot \mathrm{\rho}_{\mathrm{l}} \cdot \mathrm{R}_{\mathrm{s} \mathrm{d}} \cdot \mathrm{g} \cdot \mathrm{C}_{\mathrm{v} \mathrm{b}} \cdot \...\[\ \begin{array}{left} \mathrm{F}_{\mathrm{n}} &=\mathrm{2} \cdot \mathrm{\rho}_{\mathrm{l}} \cdot \mathrm{R}_{\mathrm{s} \mathrm{d}} \cdot \mathrm{g} \cdot \mathrm{C}_{\mathrm{v} \mathrm{b}} \cdot \mathrm{R}^{2} \cdot \Delta \mathrm{L} \cdot(-(\pi-\beta) \cdot \cos (\beta)+2-\sin (\beta)) \\ &=\mathrm{2} \cdot \rho_{\mathrm{l}} \cdot \mathrm{R}_{\mathrm{s} \mathrm{d}} \cdot \mathrm{g} \cdot \mathrm{C}_{\mathrm{v b}} \cdot \mathrm{A}_{\mathrm{p}} \cdot \Delta \mathrm{L} \cdot \frac{(-(\pi-\bet…
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/08%3A_Usage_of_the_DHLLDV_Framework/8.01%3A_IntroductionThe hydraulic gradient curves and the relative excess hydraulic gradient curves for the fixed or stationary bed regime (FB), for the sliding bed regime (SB), for the heterogeneous flow regime (He) and...The hydraulic gradient curves and the relative excess hydraulic gradient curves for the fixed or stationary bed regime (FB), for the sliding bed regime (SB), for the heterogeneous flow regime (He) and for the homogeneous flow regime (Ho) have to be determined. All equation have two numbers, the first number refers to the location where the equation is derived or first used, and the second number is the equation number in this chapter.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/05%3A_Initiation_of_Motion_and_Sediment_Transport/5.03%3A_Erosion_Bed_Load_and_Suspended_Load\[\ \mathrm{C}_{\mathrm{v s}}(\mathrm{z})=\frac{\frac{\mathrm{C}_{\mathrm{v B}}}{\mathrm{1 - C}_{\mathrm{v B}}}{ \cdot \mathrm{e}^{-\frac{\mathrm{6} \cdot \mathrm{v}_{\mathrm{t}}}{\beta_{\mathrm{sm}} ...\[\ \mathrm{C}_{\mathrm{v s}}(\mathrm{z})=\frac{\frac{\mathrm{C}_{\mathrm{v B}}}{\mathrm{1 - C}_{\mathrm{v B}}}{ \cdot \mathrm{e}^{-\frac{\mathrm{6} \cdot \mathrm{v}_{\mathrm{t}}}{\beta_{\mathrm{sm}} \cdot \mathrm{\kappa} \cdot \mathrm{u}_{*}} \cdot \frac{\mathrm{z}}{\mathrm{H}}}}}{\mathrm{1}+\frac{\mathrm{C}_{\mathrm{v B}}}{\mathrm{1 - C}_{\mathrm{v B}}} \cdot \mathrm{e}^{-\frac{\mathrm{6} \cdot \mathrm{v}_{\mathrm{t}}}{\beta_{\mathrm{sm}} \cdot \mathrm{\kappa} \cdot \mathrm{u}_{*}} \cdot {\fr…
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/00%3A_Front_Matter/03%3A_About_the_Author_and_EditorIn 1992 and 1993 he was a member of the management board of Mechanical Engineering & Marine Technology of the DUT. The fundamental part of the research focuses on the cutting processes of sand, clay a...In 1992 and 1993 he was a member of the management board of Mechanical Engineering & Marine Technology of the DUT. The fundamental part of the research focuses on the cutting processes of sand, clay and rock, sedimentation processes in Trailing Suction Hopper Dredges and the associated erosion processes.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/11%3A_Appendices/11.04%3A_Appendix_D-_Flow_Regime_DiagramsFigure 13.4-1: Flow regime diagram D p =0.0254 m (1 inch) and C vs =0.100. Figure 13.4-2: Flow regime diagram D p =0.0254 m (1 inch) and C vs =0.175. Figure 13.4-3: Flow regime diagram D p =0.0254 m (...Figure 13.4-1: Flow regime diagram D p =0.0254 m (1 inch) and C vs =0.100. Figure 13.4-2: Flow regime diagram D p =0.0254 m (1 inch) and C vs =0.175. Figure 13.4-3: Flow regime diagram D p =0.0254 m (1 inch) and C vs =0.250. Figure 13.4-4: Flow regime diagram D p =0.0254 m (1 inch) and C vs =0.325. Figure 13.4-5: Flow regime diagram D p =0.0508 m (2 inch) and C vs =0.100. Figure 13.4-6: Flow regime diagram D p =0.0508 m (2 inch) and C vs =0.175.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/06%3A_Slurry_Transport_a_Historical_Overview/6.05%3A_The_Newitt_et_al._(1955)_Model\[\ \begin{aligned} \Delta \mathrm{E}_{\mathrm{p}, \mathrm{s}} &=\Delta \mathrm{p} \cdot \mathrm{Q}_{\mathrm{v}} \cdot \Delta \mathrm{t}=\Delta \mathrm{p} \cdot \mathrm{v}_{\mathrm{l} \mathrm{s}} \cdo...\[\ \begin{aligned} \Delta \mathrm{E}_{\mathrm{p}, \mathrm{s}} &=\Delta \mathrm{p} \cdot \mathrm{Q}_{\mathrm{v}} \cdot \Delta \mathrm{t}=\Delta \mathrm{p} \cdot \mathrm{v}_{\mathrm{l} \mathrm{s}} \cdot \mathrm{A}_{\mathrm{p}} \cdot \Delta \mathrm{t}=\Delta \mathrm{p} \cdot \mathrm{A}_{\mathrm{p}} \cdot \Delta \mathrm{H} \\ &=\frac{\mathrm{A}_{\mathrm{p}} \cdot \mathrm{v}_{\mathrm{l} \mathrm{s}} \cdot \Delta \mathrm{t} \cdot\left(\mathrm{C}_{\mathrm{v} \mathrm{s}} \cdot \rho_{\mathrm{s}}+\left(\…
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/06%3A_Slurry_Transport_a_Historical_Overview/6.26%3A_Conclusions_and_Discussion_Physical_ModelsHowever for the sliding bed regime and the low line speed heterogeneous regimes they differ and the lower the line speed the larger the difference. The downside is, that the division between the 4 fra...However for the sliding bed regime and the low line speed heterogeneous regimes they differ and the lower the line speed the larger the difference. The downside is, that the division between the 4 fractions depends on the particles size and the pipe diameter and not on the line speed or relative submerged density. Based on a set of continuity and force equilibrium equations, the amount of solids in the heterogeneous layer and the thickness and the velocity of the moving bed layer are determined.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/06%3A_Slurry_Transport_a_Historical_Overview/6.01%3A_IntroductionWith the knowledge that the main Dutch and Belgium dredging contractors use the Durand & Condolios (1952) and Fuhrboter (1961) models in a modified form, while companies in the USA and Canada often us...With the knowledge that the main Dutch and Belgium dredging contractors use the Durand & Condolios (1952) and Fuhrboter (1961) models in a modified form, while companies in the USA and Canada often use the Wilson (1992) model in a modified form or the SRC model, the study started with a comparison of these models.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Slurry_Transport_(Miedema)/06%3A_Slurry_Transport_a_Historical_Overview/6.21%3A_The_Doron_et_al._(1987)_and_Doron_and_Barnea_(1993)_ModelThese forces consist of, on the right hand side the resisting forces, the sliding friction force between the moving bed and the stationary bed, the Darcy Weisbach friction force between the moving bed...These forces consist of, on the right hand side the resisting forces, the sliding friction force between the moving bed and the stationary bed, the Darcy Weisbach friction force between the moving bed and the stationary bed, the sliding friction force between the moving bed and the pipe wall and the Darcy Weisbach friction force between the moving bed and the pipe wall.
