Energy Technology

Several aerodynamic improvements and flow control techniques are used in jet aircraft wings in order to allow a better movement through the air and thus enhance the overall performance of the airplane. The Georgia Institute of Technology, Atlanta is now working on using these same techniques with trucks and trailers. According to the latest tests using a full-size truck show clearly how the techniques enhance fuel efficiency reducing fuel costs by as much as 12 percent. The techniques can also improve directional control and breaking, enhancing this way safety as well on the roads.

Robert Englar, principal research engineer of Aerospace, Transportation and Advanced Systems Laboratory of the Georgia Tech Research Institute said that they have resolved unknowns from previous testing, and that they have demonstrated that this technology functions in trucks as well as it does in airplanes, and they expect that the trucking industry will consider an estimated 12 percent of fuel expenditure reduction worthy of pursuing. This amount will improve fuel economy resulting in approximately 2,400 million gallons of fuel worth of savings for the United States heavy truck fleet.

The techniques employed in this technology include aerodynamic improvements made possible by geometry modifications in the trucks that generate savings of up to 6 to 7 percent. These modifications include rounding aft trailer corners, installation of fairings, as well as other modifications that smooth air flow over the boxy trucks. The additional savings of 5 percent are achieved through pneumatic devices that blow air from vents at the rear of the vehicle to prevent separation of air flow.

By 1900, only 124 years after declaring independence, the United States had grown and expanded into one of the most prosperous and influential countries in the world. The economy was strong, driven by the power of steel locomotives, steam engines, electricity, and the beginning of automated manufacturing. But the burgeoning economic productivity, along with the complexity of 20th century machinery, created problems when different manufacturers had to work together. Disagreements arose over the units of measurement and how to apply them. For example, one company’s “gallon” might not be the same as another company’s. Without standards, the parts or containers made by one company did not fit another company’s items, resulting in chaos.

On March 3, 1901, the U.S. government chartered the National Bureau of Standards to remedy this problem. Beginning with a staff of 1 2, the new bureau quickly went to work, improving the standards of length and mass measurements, and establishing new standards of temperature, time, and light. Time was especially important, as it synchronizes the activities of so many people. How do railroads, radio and television networks, and other time-conscious organizations know what time it is – and keep the same time? The bureau has provided time signals from a radio station, WWV, since 1 923. Governing this timekeeping is an atomic clock so precise that it will not gain or lose a second in 60 million years!

The National Bureau of Standards changed its name to the National Institute of Standards and Technology in 1988. Today, the NIST has facilities in Gaitherburg, Maryland, and Boulder, Colorado, and employs about 2,800 scientists, engineers, and staff. The NIST continues to improve measurement technology and standards, helping promote economic and technological progress. Laboratories at the NIST include the Building and Fire Research Laboratory, the Center for Nanoscale Science and Technology, the Information Technology Laboratory, the Manufacturing Engineering Laboratory, the Physics Laboratory, and others.

Here’s a science activity for kids that offers basic exposure to density and the law of gravity. It also gives your child an opportunity to engage in the trial and error method of problem solving. It’s very simple and lots of fun.

You’ll be making a miniature version of hot air balloons. Each balloon should take about one minute to make. Your child will love helping to put the hot air balloons together.

Here’s what to do:

Pick up helium balloons from your community party supply store. You’ll need one balloon for each participant.

For the basket part of the hot air balloon, use a paper cup or 12″ x 12″ felt square. If you use a paper cup, tape three pieces of string to the top of the cup, and then tie the string to the base of the balloon. If you use a felt square, tie each of the four corners and attach those to the base of the balloon. (If you want to go a step further, for a more realistic looking basket cut off the bottom four inches of an empty bag of specialty coffee and rinse it out-the material is perfectly suited for this activity.)

Your living room is the perfect location to get started.

The objective: fill the basket with just enough household items to cause the balloon to hover for ten seconds without touching the ceiling. The items might include marbles, buttons, bottle caps and Q-Tips. Put these items in a bowl for selection. Keep a pair of scissors handy–as your child fine tunes the density it may become necessary to cut a Q-Tip in half.

Consider the following variation: put all the items in a line for selection. Take turns selecting one item until each person has ten. Place items into balloon baskets and launch the balloons. The objective is to have your balloon float slowest to the ceiling. In order to improve results, each person may exchange one of their items for a new item. Re-launch the balloons. Continue the process of exchanging one item after each launch. Keep experimenting until one player causes a balloon to hover for ten seconds.

There are many other variations to this science activity that you can pursue on your own (–for example, log the difference in items used from one day to the next as the balloons lose helium). Regardless of how you go about it, this activity will give your child an opportunity to engage in trial and error problem solving while gaining basic exposure to density and the law of gravity. You may also find it surprisingly adept at bringing out the fidget and tinker nature of parents. Have fun!