Investigation of flow through centrifugal pump impellers 6

... and M6 at pump design point The existence of back flow in the passages will increase the loss of the flow and thus reduce the efficiency of the centrifugal pump Some modification of the pump ... pressure side of blade surface The change of flow patterns at low flow rate is not obvious for model impellers M3 and M6, but it can still be seen that the recirculation...

Ngày tải lên: 16/09/2015, 17:14

... M5 Rotational speed (rpm) 2900 1 450 2900 1 450 2900 1 450 Design flow (m /h) 27 14 270 180 70 45 Design efficiency (%) 55 48 76 81 74 .5 65 Calculated efficiency (%) 58 .68 52 .5 79. 25 84.86 76 .5 ... size centrifugal pumps 82 Chapter Results and Discussions Table 5. 1 Specifications of model impellers Impeller Model M1 M2 M3 M4 M5 M6 Design speed 54 0 600 2900 1 450 2900...

Ngày tải lên: 16/09/2015, 17:14

... standard of our pump test stand This international standard is the first of a set dealing with acceptance tests of centrifugal, mixed flow and axial pumps; they correspond to three classes of tests ... each flow rate The performance test characteristics of design point are also recorded For example, to test the fourth model pump M4 at rotational speeds of 2900 rpm and 145...

Ngày tải lên: 16/09/2015, 17:14

... Ideal Gas Law: ρg = wp R0 T (3. 5) where w is the molecular weight of gas, and R0 is the Universal Gas constant Eqs (3. 1), (3. 2), (3. 3), (3. 4) and (3. 5) form a closed set of non-linear partial differential ... value σ =1 37 Chapter Theoretical Models of Two-Phase Flow 3. 4 Boundary Conditions The implementation of boundary conditions for multiphase flow is very similar to t...

Ngày tải lên: 16/09/2015, 17:14

... σ * =1 /2, σ =1 /2 22 Chapter Theoretical Models of Single-Phase Flow 2. 2.4 Shear Stress Transport (SST) Model While standard two-equation models provide good predictions for many flows of engineering ... (2. 9) and (2. 10) is the turbulent kinetic energy production term, which for incompressible flow is: Pk = µ t ∇U • (∇U + ∇U T ) (2. 11) Eqs (2. 1), (2. 2), (2. 9) and (2. 10) fo...

Ngày tải lên: 16/09/2015, 17:14

... the flows in centrifugal pump are three-dimensional turbulent flows, and a clear understanding of turbulent flow structures is essential for the optimization of the performance of centrifugal pumps ... volumetric flow and the total breakdown of the flow may occur when the gas fraction reaches about 8 -10 % of the total volumetric flow rate For two-phase flow applicat...

Ngày tải lên: 16/09/2015, 17:14

... Cite this article as: Kislukhin: Stochasticity of flow through microcirculation as a regulator of oxygen delivery Theoretical Biology and Medical Modelling 2010 7:29 Submit your next manuscript ... consumption by vasomotion Math Biosci 2004, 191(1):101-108 15 Pradhan RK, Chakravarthy VS, Prabhakar A: Effect of chaotic vasomotion in skeletal muscle on tissue oxygenation M...

Ngày tải lên: 13/08/2014, 16:20

... of flow rates The unsteady numerical simulation at three different flow rates of 0.7Qdesign, Qdesign and 1.3Qdesign show that the inlet flow structure of straight intake section is flow rate ... exit into volute casing, the highly distorted radial flow, either at design or off -design condition causing unsteadiness flow in the volute casing The flow inside the volu...

Ngày tải lên: 10/09/2015, 08:27

... rigid core exert hindrance to self- assembly whereas the pyrimidine groups stabilized the self- assembly of jacketed polymers A series of novel jacketed liquid crystalline polymers, in which the terphenyl ... expected to help the self- assembly of the polymers The length of the alkyl chain and position of the alkyl chain on the mesogenic units appears to have s...

Ngày tải lên: 16/09/2015, 17:11

... rib arrangements on heat transfer and flow behavior in a rectangular rib roughened passage” International Journal of Heat and mass transfer; 123: 675-681, 2001 [6] Lau S.C., McMillin R.D and Han ... studies of augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated wall in transverse, inclined, V-continu...

Ngày tải lên: 05/09/2013, 16:10

... soup manufacturers‟ fiscal calendars and earnings management incentives We find that soup manufacturers increase the frequency and change the mix of marketing promotions when they need to meet earnings ... establishment of a total marketing budget requires negotiation between both brand 16 Blattberg and Neslin (1990) p.382 11 managers and senior management. 17 This suggests tha...

Ngày tải lên: 07/03/2014, 00:20

... mutation of His115 to Leu compared to that observed for wild-type Nox2 [13,14] To assess the contribution of histidines 119 and 111 to the conduction of protons through Nox2, the ability of CHO91H111/115L, ... conduction of protons through Nox2 Mutation of individual histidine residues in human Nox2 To investigate the individual roles...

Ngày tải lên: 07/03/2014, 16:20

... L -cysteine at glassy carbon electrode using Nile blue A as a mediator Sens Actuat B 2007, 122, 282–288 Nezamzadeh-Ejhieh, A. ; Hashemi, H.S Voltammetric determination of cysteine using carbon paste ... Chromatograms of cysteine were registered and peak height was calculated using a chromatogram data integrator (Scientific Information Service Corp., Davis, CA, USA) The...

Ngày tải lên: 21/03/2014, 12:18

Ngày tải lên: 28/03/2014, 20:20

... through training and into and out of the The computable model of an eye care MEES showing the stocks and flows of personnel through training and into and out of the workforce Figure illustrates the ... repeated for the four stages of training (Fig 5) To complete the non-physician sector of eye care personnel deployment and trainin...

Ngày tải lên: 18/06/2014, 17:20