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Related Concept Videos

Free Jet01:14

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Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
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Impulse01:13

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Impulse Response01:17

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The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
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Principle of Impulse and Moment01:15

Principle of Impulse and Moment

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When one considers a rigid body undergoing a plane motion, which is essentially a blend of translational and rotational movement, the application of Newton's second law gives the formula for the translational movement of such a body. If this equation is multiplied by a time interval, dt, and then integrated over the limits of integration, it results in an equation that embodies the principle of linear impulse.
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Impulse-Momentum Theorem00:49

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The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
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Consider a ball of mass m, attached to a massless rod of known length, subjected to a time-dependent torque. If the initial velocity of the mass is known, then the final velocity of the mass for time t can be determined using the principle of angular impulse and momentum.
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Related Experiment Video

Updated: Feb 13, 2026

High-resolution Patterning Using Two Modes of Electrohydrodynamic Jet: Drop on Demand and Near-field Electrospinning
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Impulsively Induced Jets from Viscoelastic Films for High-Resolution Printing.

Emre Turkoz1, Antonio Perazzo1, Hyoungsoo Kim1

  • 1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.

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This study investigates non-Newtonian fluid jet formation using a laser nozzleless method. A new criterion using dimensionless parameters predicts single-drop breakup for optimized printing.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Printing technology

Background:

  • Jet formation from non-Newtonian fluids is crucial for advanced printing and dispensing.
  • Controlling drop formation is challenging due to complex fluid rheology.

Purpose of the Study:

  • To investigate jet formation regimes in non-Newtonian fluids using a laser-based nozzleless method.
  • To develop a predictive criterion for achieving single-drop breakup in printing applications.

Main Methods:

  • Utilized a laser-based nozzleless printing technique.
  • Employed time-resolved imaging to observe jet formation dynamics.
  • Characterized fluid rheology and process parameters.

Main Results:

  • Identified multiple jet formation regimes (zero, single, multiple drops per pulse).
  • Regime transitions depend on ink thickness, rheology, and laser energy.
  • Developed a methodology using dimensionless parameters to predict single-drop breakup.

Conclusions:

  • A predictive criterion for single-drop breakup was established using dimensionless parameters.
  • This methodology enables optimization of printing parameters for non-Newtonian inks.
  • Offers a pathway to improve printing quality and precision.