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Related Concept Videos

Types Of Collisions - I01:04

Types Of Collisions - I

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When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
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Types of Collisions - II01:19

Types of Collisions - II

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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Elastic Collisions: Introduction01:00

Elastic Collisions: Introduction

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An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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Collisions in Multiple Dimensions: Problem Solving01:06

Collisions in Multiple Dimensions: Problem Solving

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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
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Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
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Jet Colliding and Mixing Efficiency.

Gianni De Lucia1, Massimo Varisco1, Richard-Emmanuel Eastes2

  • 1University of Applied Sciences of Western Switzerland, HES-SO, HEIA-FR, PĂ©rolles 80, CH-1705 Fribourg, Switzerland.

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Summary
This summary is machine-generated.

This study evaluated a new Gjosa impinging jet mixer using two methods. While the Nile Red assay favored a Caterpillar mixer, Williamson ether synthesis identified the Gjosa mixer as superior, highlighting method-dependent performance.

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Area of Science:

  • Chemical Engineering
  • Fluid Dynamics
  • Reaction Engineering

Background:

  • Efficient mixing is crucial for chemical reactions and process intensification.
  • Micromixers offer enhanced mixing but require careful characterization.
  • A novel, low-cost impinging jet colliding mixer from Gjosa warrants performance evaluation.

Purpose of the Study:

  • To characterize the mixing performance of a new Gjosa impinging jet colliding mixer.
  • To compare the Gjosa mixer against commercial micromixers using two distinct methods.
  • To assess the influence of the characterization method on mixer performance ranking.

Main Methods:

  • Nile Red dye extraction method for assessing mixing efficiency.
  • Williamson ether synthesis in biphasic conditions as a second mixing performance indicator.
  • Comparative analysis against commercial micromixers: Caterpillar CPMM-R300, T-mixer, LTF MR-MX, and LTF MR-MS.

Main Results:

  • The Nile Red method indicated the Caterpillar mixer as the most effective.
  • Excellent mixing results were also observed with two Gjosa mixers operating in series.
  • The Williamson ether synthesis revealed the Gjosa mixer as the top performer, contrasting with Nile Red results.

Conclusions:

  • Micromixer performance is highly dependent on the chosen characterization technique.
  • The new Gjosa impinging jet mixer demonstrates competitive or superior mixing performance.
  • Further investigation is needed to reconcile discrepancies between different mixing assessment methods.