![]() ![]() Caution: This calculator is for the theoretical surface area of helical round fins. All inputted dimensions need to be in decimal inches. Then, all the goals were optimized together, considering the priority of the goals, and the optimum results were found to be Reynolds number of 42,000, fin height of 50 mm and streamwise distance between fins of 51 mm. Input your dimensions in the editable boxes below. First of all, each goal was optimized separately. An L9(33) orthogonal array was selected as an experimental plan. He investigated multi parameters such as fins number, percentage of notch area from a fin and surface heat flux on the coefficient of convection heat transfer. ![]() The fins are 0. Example 2: Heat sink A 12cm wide and 18cmhigh vertical hot surface in 25C air is to be cooled by a heat sink with equally spaced fins of rectangular profile. Nusselt number and friction factor were considered as performance parameters. sinks with closely spaced fins are not suitable for natural convection. Using a Taguchi experimental design method, optimum design parameters and their levels were investigated. Enhancement efficiencies varied between 1.4 and 2.6 depending on clearance ratio and interfin spacing ratio. The experimental results showed that the use of circular cross section pin fins may lead to heat transfer enhancement. Correlation equations were developed for the heat transfer, friction factor and enhancement efficiency. The experiments covered the following ranges: Reynolds number 13500–42,000, clearance ratio (C/H) 0, 0.33 and 1 and interfin spacing ratio (Sy/D) 1.208, 1.524, 1.944 and 3.417. Compared to base area of the rectangular fins, the cylindrical fins will have an unfinned area of tw 4D2/4 0.000205 m2 4(19.635x10-6 m2) 0. All analyses were performed for fins of rectangular cross section. The channel had a cross section area of 100–250 mm2. opening angles between adjacent fins and various values of surface emissivity. And that number must be six, because six times four equals 24.This paper reports the heat transfer enhancement and corresponding pressure drop over a flat surface equipped with circular cross section perforated pin fins in a rectangular channel. So our length has to be some number that when it's multiplied times four, we get 24 for the answer. Is 24 square meters, so the space the rectangleĬovers is 24 square meters, and the length, we don't know the length. We can actually solve it without ever even seeing the rectangle, because we know the area It might be helpful to visualize it, but I'm gonna show you here, Again, we can use ourįormula that tells us area of a rectangle is the ![]() Have a picture to look at, but we have enough information What is the length of the rectangle? So this time we don't even We can also label the length (l), width (w), and height (h) of the prism and use the formula, SA2lw+2lh+2hw, to find the surface area. To find the surface area of a cuboid, add the areas of all 6 faces. The width of the rectangle is four meters. Surface area is the sum of the areas of all faces (or surfaces) on a 3D shape. ![]() So that means the width of our picture is eight centimeters. So what number timesġ0 equals 80 is eight. It's multiplied times 10, we get 80 for an answer. Is that we need our width to be a number that when Times the width, we don't know the width. We're told that thisĭistance from here to here, this length is 10 centimeters, Is 80 square centimeters, so we already know the area, and we can use that to help us. And on this picture, in this rectangle, we are told that our area So if we multiply the two side lengths of a rectangle, we get its area. Length of the rectangle, over here, the length, times the width. Rectangle can be found by multiplying the Know a special formula or a special equation to find width, but we do know one toįind area of a rectangle, so let's use that formulaĪnd see how it can help us. What is the width of the picture? So here's our picture, this super fun giraffe listening to music and our picture's shape is a rectangle and we're asked to find the If you have a rectangle with the area of 10 and you know that one side is 5 then to figure out the other side you can do 10 divided by 5 to get 2 or do 5 x 10 and then solve for the blank which is the same thing. The picture has an area of 80 square centimeters. To solve for the missing length when given the area uses division. ![]()
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