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Related Concept Videos

Laminar Flow01:27

Laminar Flow

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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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Mitigating thermal stratification in lakes/reservoirs through wind-powered air diffusers.

Oğuz Hazar1, Sebnem Elçi1

  • 1Izmir Institute of Technology, Izmir, Turkey.

Water Environment Research : a Research Publication of the Water Environment Federation
|September 10, 2024
PubMed
Summary

A novel wind-powered system uses Savonius rotors for artificial water mixing, addressing thermal stratification. Four-stage rotors achieved 95% mixing efficiency, while three-stage rotors showed better power performance.

Keywords:
Savonius rotorartificial destratification efficiencythermal stratificationwind‐powered artificial mixing

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Area of Science:

  • Environmental Engineering
  • Renewable Energy Systems
  • Fluid Dynamics

Background:

  • Thermal stratification in large water bodies causes significant water quality degradation.
  • Artificial mixing systems are crucial for mitigating these issues in reservoirs.
  • Existing systems often rely on electrical energy, posing limitations.

Purpose of the Study:

  • To design and experimentally evaluate a wind-powered artificial mixing system using Savonius rotors.
  • To compare the performance of different Savonius rotor configurations (three-stage vs. four-stage) for artificial mixing.
  • To assess rotor performance in terms of power, torque, and mixing efficiency.

Main Methods:

  • Experimental testing of various Savonius rotor combinations (three-stage and four-stage) with different phase shifts.
  • Measurement of rotor power and torque coefficients.
  • Evaluation of artificial mixing efficiency in a controlled water tank simulating thermal stratification.

Main Results:

  • The three-stage rotor with a 60° phase shift demonstrated superior power and torque coefficients (0.14 power efficiency).
  • The four-stage rotor with a 45° phase shift achieved the highest mixing efficiency at 95%.
  • Four-stage rotors generally outperformed three-stage rotors in mixing efficiency, while three-stage rotors excelled in power and torque.

Conclusions:

  • Wind-powered artificial mixing systems offer a viable alternative to electrically powered systems for addressing thermal stratification.
  • Rotor design (stage number and phase shift) significantly impacts both power generation and mixing efficiency.
  • Specific configurations, like the four-stage rotor, are highly effective for achieving efficient artificial destratification in water bodies.