Welcome to Clip from Spiral logo

Interactive video lesson plan for: Jumping water droplets improve power-plant efficiency

Activity overview:

The efficiency of most industrial plants depends crucially on water vapor condensing on metal plates or condensers, and how easily the condensed water can fall away allowing for more droplets to form. On a typical, flat-plate condenser, water vapor condenses to form a liquid film on the surface, drastically reducing the condenser's ability to collect more water, and ultimately acting as a barrier to heat transfer.

By creating hydrophobic surfaces, either through chemical treatment or through surface patterning, researchers have been able to prevent this problem by encouraging water droplets to form and fall away. Now a team of MIT researchers have taken this process a step further by making surfaces that are patterned at multiple scales.

A group from MIT's mechanical engineering department found that the energy, released as tiny droplets of water that merge to form larger ones, is enough to propel the droplets upward from the surface. The removal of droplets doesn't depend solely on gravity — droplets don't just fall from the surface — they actually JUMP away from it.

Using this information, their new process produces a surface that resembles a bed of tiny, pointed leaves sticking up form the surface; these nanoscale points minimize contact between the droplets and the surface, making the release easier. After the leaflike pattern is created, a hydrophobic coating is applied using a solution that bonds itself to the patterned surface, without significantly altering its shape.

This patterning can be made on a film that can be applied to a variety of surfaces, including the copper tubes and plates commonly used in commercial power plants. This technology could also be useful for other processes where heat transfer is important, such as in dehumidifiers, and for heating and cooling systems in buildings.

Read more: http://mitne.ws/TNu26I

Video: Melanie Gonick, MIT News
Additional footage/still images: Nenad Miljkovic

Tagged under: Jump,Water,Energy,Warming,Power,heat transfer,power plants,desalination,MIT,MIT News Office,droplets,condensation,condensers

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

Share on:

Share Jumping water droplets improve power-plant efficiency on Google+ Share Jumping water droplets improve power-plant efficiency on Twitter Share Jumping water droplets improve power-plant efficiency on Facebook Pin Jumping water droplets improve power-plant efficiency Email Jumping water droplets improve power-plant efficiency

Ready to see what else Spiral logo can do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.


Carry out a quickfire formative assessment to see what the whole class is thinking


Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices


Turn any public video into a live chat with questions and quizzes

1000s of teachers use Spiral to deliver awesome, engaging activities that capture students' understanding during lessons.

Now it's your turn Sign up

Spiral Reviews by Teachers and Digital Learning Coaches

Review of Spiral by teacher: Kathryn Laster @kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Review of Spiral by teacher: Room 220 Math Stars @3rdgradeBCE

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

Review of Spiral by teacher: Miss Ord @ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

Review of Spiral by teacher: Adam J. Stryker @strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!

Review of Spiral by teacher: Dr Ayla Göl @iladylayla

A good tool for supporting active #learning.

Review of Spiral by teacher: Brett Erenberg @BrettErenberg

The Team Up app is unlike anything I have ever seen. You left NOTHING out! So impressed!

Get the Clip Chrome Extension & Create Video Lessons in Seconds

Add Clip to Chrome