Change temperature within very small timeframe

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Discussion Overview

The discussion revolves around the feasibility of rapidly heating and cooling very small quantities of ethanol (less than 0.2 mm³) to facilitate the operation of a soft actuator. The focus is on achieving this temperature change within a one-second timeframe, exploring both theoretical and practical aspects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the specifics of the application to better understand the requirements.
  • Another suggests using a small electric heating element in close contact with the ethanol, surrounded by a colder environment to facilitate rapid heating.
  • A different participant proposes the use of hot and cold heat sinks, mentioning saucepans as a potential solution for heat management.
  • The original poster explains that the actuator operates by mixing ethanol with silicones, and they seek a method to heat and cool the mixture quickly for contraction and relaxation.
  • One participant notes that cooling requires contact with a colder object and emphasizes that the heating source must be sufficiently powerful to counteract the cooling effects.

Areas of Agreement / Disagreement

Participants express various ideas and suggestions, but there is no consensus on the best method to achieve the desired heating and cooling within the specified timeframe. Multiple competing views remain regarding the feasibility and methods of implementation.

Contextual Notes

Participants mention the importance of maintaining a cold object for effective cooling and the need for a powerful heating source, but specific assumptions and limitations regarding the setup and materials are not fully explored.

Who May Find This Useful

This discussion may be of interest to those working on soft actuators, rapid thermal management systems, or anyone exploring the heating and cooling of small volumes of liquids in engineering applications.

TeunKeusters
I had no idea where to place this, so my apologies if I chose the wrong topic.

Hi,

For a certain application I need to heat very small (< 0.2 mm^3) quantities of ethanol until it vaporizes (78 °C) and then cool it down again until it's a liquid again. The hard part is that this all needs to happen within 1 second. Do you guys have any idea whether this would be possible (both theoretically and practically)?

Thanks in advance!
 
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Maybe . Please tell us more about what you are trying to do .
 
A very small electric heating element in good contact to the ethanol, surrounded by a colder environment?
 
A hot heat sink, followed by a cold heat sink. Maybe sauce pans for heat sinks.
 
Thanks for responding guys! I'll indeed elaborate somewhat on the application:
I am working on some kind of soft actuator. It works by mixing ethanol with silicones. When the mixture is heatened, the ethanol (which is now distributed around the silicones in the form of bubbles) expands, causing the entire thing to grow. This works, but now I am trying to make it so that the actuator/muscle can contract and relax within a second. I have no experience, nor knowledge considering lasers. Could it be possible to heat the thing up very locally. And moreover, would it be possible to cool it in the same timeframe?
 
Cooling only works with a contact to a colder object unless the ethanol is so spread out that radiation is relevant. The same applies for this colder object - which means it should stay cold all the time. Therefore the heating source has to be powerful enough to overcome the cooling.
 

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