Haris [32] discussed CuO-water and Al2O3-waterin a cylinder at constant wall temperature,increasing the concentration, laminar flow convective heat transfer, he found that at low concentration heat transfer characteristic of both (CuO-water and Al2O3-water)are same and close to each other.
The compressive strength and workability of concrete by partial replacement of cement with nano-phase Al 2 O 3 particles. Al 2 O 3 nanoparticles with the average diameter of 15 nm were used with ...
Sand Al2O3 Technology Produced by Diaspore Separation with High Concentration of Semenite According to the characteristics of China's diaspore resource and production process, the process of agglomeration and growth of seed crystals in sodium aluminate solution was …
Five batches were designed using wastes representing ceramic roller waste, magnesite, and silica sand, shaped and fired at 1300 °C/2 h, and one batch was selected at 1200 °C.
The equation used to calculate the volume fraction of the nanorefrigerants is as follows: (1) φ = m n / ρ n m n / ρ n + m r / ρ r where, φ is the nanoparticle concentration (vol.%); m n and m r are the masses of the nanoparticle and refrigerant, respectively; and ρ n and ρ r are the density of the nanoparticle and liquid phase density of the refrigerant, respectively. ...
This study deals with the modeling, sensitivity analysis and uncertainty quantification of one-dimensional transport of nano-sized (~82 nm) aluminum oxide particles in …
The grain concentration of a stream of grain-containing fluid is measured by positioning an abradable radioactive material in the stream, measuring the stream velocity and the rate of abrasioninduced reduction in radiation emission, and determining the grain concentration from that of a stream of known composition that causes the measured rate of radiation emission …
Incorporation of nano-Al2O3 particles into a Ni–Co alloy by electrodeposition influences the corrosion properties, morphology, and structure of the layers. The resistance against corrosion of Ni–Co/Al2O3 composite films deposited on stainless steel was investigated in a 0.1-M NaCl solution by potentiodynamic polarization. The presence of nanoparticles …
White light-emitting diodes (wLEDs) have attracted considerable attention for their high efficiency, high brightness, and long operational lifetime [[1], [2], [3], [4]].State-of-the-art wLEDs are produced by combining blue LED chips with yellow-emitting phosphors Y 3 Al 5 O 12:Ce(YAG:Ce) dispersed in organic binders [5, 6]pared with the Ce:YAG phosphor, the …
MgO–Al2O3–SiO2 ... aluminum oxide, sodium carbonate anhydrous, boron oxide, zinc oxide, and zirconium sand. All these starting materials are commercially purchased and the purity is higher than 99 %. The chemical composition ... Effect of the ZrO 2 concentration on the crystallization behavior and the mechanical properties of high-strength ...
In this work, critical coagulation concentration (CCC) values for GO with different sizes, from micro to nanosheet, were measured with NaCl and CaCl 2 electrolytes, and the …
Notably, when the Mg doping concentration is 2 mol %, the detector exhibits a total current of 0.030 A. When the Mg doping concentration is increased from 0 to 2 mol %, …
In acidic environments, Al2O3 reacts with hydrogen ions (H+) to form aluminum ions (Al3+) and water (H2O). The reaction can be represented as: Al2O3 + 6H+ → 2Al3+ + …
Commercial high purity α-Al 2 O 3 powder (mean grain size of 170 nm, purity > 99.99%) purchased from Taimei company was used as starting material. The dopant source for MgO was magnesium nitrate (purity > 99.9%; Sinopharm, China). The starting α-Al 2 O 3 powder was first mixed with the magnesium nitrate by balling milling for 24 h in deionized water. The …
The effect of ionic strength (IS), flow rate, and nanoparticle concentration on the transport and deposition of aluminum oxide nanoparticles (Al2O3 NPs) in saturated sand was investigated. Mobility of Al2O3 NPs was influenced by IS, the highest mobility was observed in DI water (97% elution of the i …
With the continuous development of additive manufacturing technology, 3D has been widely applied in the fields of polymer composite molding, structural ceramics, and metal material molding [12].Ceramic 3D techniques mainly include direct-write molding, photocured molding, inkjet , and selective laser sintering [13].The most common …
6. Concentration of Acids and Ammonium Hydroxide (NH 4 OH) 6.1 When acids and ammonium hydroxide are specified by name or chemical formula only, concentrated reagents of the following percent concentrations are intended: Sp Gr % Hydrochloric acid (HCl) 1.2 36 to 38 Hydrofluoric acid (HF) 1.2 48 to 51 Nitric acid (HNO 3) 1.4 69 to 71 ...
Sand Al2O3 Technology Produced by Diaspore Separation with High Concentration of Semenite . ... The innovation results are as follows: 1. The effect of temperature, solid content, concentration, and supersaturation on the seed crystal decomposition process was revealed; 2. The first time the development of a high alkali and high concentration ...
The addition of La as an additive at a concentration of 5% not only facilitated the catalytic activity but also effectively slowed down the deactivation of the catalyst, enhancing its stability. The Cu/ZnO/Al2O3 catalyst modified with 5% La did not deactivate during 100 h stability test and only showed a 17% deactivation in 1000 h stability test.
Percent Al2O3 is a common method of quoting the strength of aluminium-based coagulants on a w/w basis. Another method of referring to concentration is to state the aluminium content, which is roughly half the Al2O3 content. For example, liquid alum of 7.5% w/w Al2O3, which is the same as 4.0% w/w aluminium (Al).
The concentration of PEG solutions was analyzed by total organic carbon (TOC). The average pore size is defined as same as the hydraulic diameter of the PEG with 50% rejection rate. And the MWCO of the membrane is defined as same as the average molecular weight of the PEG with 90% retention [27].
A green manufacturing technology named "electrostatic minimum quantity lubrication (EMQL)" with water-based Al2O3 nanoparticle fluids as cutting fluids was developed in order to improve the cutting property and minimize oil mist concentration during the machining process. The capillary penetration mechanism, oil mist concentration, and heat transfer …
The elution concentration of Al2O3 NPs increased with increased TC concentration. Al2O3 NPs showed greater mobility at pH 7 and 3 than at pH 5.
Al2O3 water nanofluid could flow through tinny passages in MEMS to improve its efficiency. Use of nanofluid increases (CHF) critical heat fluxes in forced convection hence it is …
Fig. 2 shows the polarization curves measured on X-65 steel electrode coated with the electrodeposited Ni–Co–Al 2 O 3 composites fabricated with the different Al 2 O 3 concentrations in water–oil–sand slurry. It is seen that the coated steel showed apparent passivity in the slurry. With the increase in Al 2 O 3 concentration in the electrolyte, the …
In this work, epoxy resin samples incorporated with nano-Al2O3 of various concentrations 0, 1, 3 and 5 wt% were prepared. Surface treatment of nano-Al2O3 was performed by the saline coupling agent of γ-aminopropyltriethoxysilane (KH550) to restrict the aggregation. The thermal gravimetric analysis (TGA) of the epoxy resin/Al2O3 …
Study with Quizlet and memorize flashcards containing terms like Which of the following statements is true about how the equilibrium vacancy concentration is determined in a material A. The ENTHALPY of vacancy formation accounts for bond breakage and acts to lower the concentration of vacancies in a material while the ENTROPY of vacancy formation accounts …
The mesh density independency is investigated on using the centerline temperature as a key parameter for the case of pure water at Re = 800 and constant heat flux, q″ = 100 W/cm 2.In this study, three different mesh levels of cell volumes have been used (20, 40 and 60 μm 3). Fig. 2 shows that predictions of center line temperature are effectively grid-independent.
What is the maximum number of moles of Al2O3 that can be produced by the reaction of 0.40 mol of Al with 0.40 mol of O2? 0.20 mol. 1 / 74. 1 / 74. Flashcards; ... The volume of water that must be added in order to dilute 40 mL of 9.0 M HCl to a concentration of 6.0M is closest to. 20 mL. The halogen in this group. 1s^2 2s^2 2p^5. Which of the ...
However, sand particles with ≤ 100 µm reportedly caused severe erosion in highly turbulent flow regions of slurry pipelines [65]. ... Arguably, no sign of mass-transfer control (diffusion or concentration polarization) appears in the PDP curves for those testing conditions with an established short Warburg behavior in their EIS profiles.
The nanofluid synthesized with weight percentage concentration of 0.02, 0.04, 0.07 and 0.1. The nanosuspension preparation was done by using ultrasonication process. The lower concentration has been selected, as higher concentration may agglomerate within the basefluid. The ultrasonication for each of the nanofluid was done for 45 min.
The concentration range of Nd was chosen below 1% to prevent any cross relaxation between Nd 3+ atoms which typically occurs at concentrations above 1% [21]. Similarly, in film CR02, the Cr concentration is between 0.1 and 0.7 at. % as shown in Fig. 2 b.
The central question in this paper asks the synergistic effects of combining Al2O3 nanoparticles (NPs) and smart water at elevated temperatures for enhanced oil recovery (EOR) purposes.
