How do you calculate fin efficiency?

How do you calculate fin efficiency?

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1. The fin efficiency is defined as the ratio of the heat transfer to the fin to the heat transfer to an ideal fin. ηth =
2. qfin. hAfin(Tb − T∞) , Tf = T∞,and Afin = 2Ac + Atip (Square and Recatngular ) 1.35.
3. Atip = t × W. Fig. 2.4. Rectangular Fin. For cylindrical: Afin = πDL +

What is the cross section area of pin fin?

A pin fin of uniform, cross-sectional area is fabricated of an aluminum alloy (k=160 \mathrm{W} / \mathrm{m} \cdot \mathrm{K}). The fin diameter is D=4 mm, and the fin is exposed to convective conditions characterized by h=220 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}.

How do you find the area of a fin?

For the single rectangular fin with w = 0.041 m, and t = 0.005 m, the perimeter is 2(w+t) = 2(0.041 m + 0.005 m) = 0.092 m. The cross-sectional area, Ac = tw = (0.041 m)(0.005 m) = 0.000205 m2. The corrected length Lc = L + Ac/p = 0.03 m + (0.000205 m2)/( 0.092 m) = 0.03223 m.

What does value of fin effectiveness is 1 mean?

1. For effectiveness εf =1 indicates that the addition of the fin to the surface does not affect heat transfer at all. In other word, the heat transfer to the fin through the base area Aw is equal to the heat transferred from the same area Aw to the surrounding medium.

Why thin fins are preferred over a thick fin?

if the fin has the thickest point forward it improves its ability to handle higher angles of attack, at the cost of some drag, but it can be made thinner because of this angle of attack capability.

What is pin fin?

1. INTRODUCTION. Pin-fin arrays are a common geometry used to increase the internal heat transfer in the trailing edge region of a turbine vane. A pin-fin array is a series of short cylinders which span the cooling flow passage. They increase the internal surface area and the flow passage turbulence.

What is the value of characteristic length for cylinder?

What is the value of characteristics length for cylinder? Explanation: π R2 L/2 π R L = R/2. Explanation: For a cylindrical piece, the characteristic linear dimension is, l = volume/surface area = .00441 m.

What is the concept of scaling?

Definition: Scaling is the procedure of measuring and assigning the objects to the numbers according to the specified rules. In other words, the process of locating the measured objects on the continuum, a continuous sequence of numbers to which the objects are assigned is called as scaling.

What are the types of scaling?

There are different kinds of measurement scales, and the type of data being collected determines the kind of measurement scale to be used for statistical measurement. These measurement scales are four in number, namely; nominal scale, ordinal scale, interval scale, and ratio scale.

What are the methods of scaling?

Typically, there are four levels of measurement scales or methods of assigning numbers: (a) Nominal scale, (b) Ordinal scale, (c) Interval scale, and (d) Ratio scale. 8.  Nominal Scale is the crudest among all measurement scales but it is also the simplest scale.

What are the types of scaling techniques?

Scaling Techniques

• Primary Scaling Techniques. Nominal Scale. Ordinal Scale. Interval Scale. Ratio Scale.
• Other Scaling Techniques. Comparative Scales. Non-Comparative Scales.

What are the four measurement scales with examples?

Data can be classified as being on one of four scales: nominal, ordinal, interval or ratio. Each level of measurement has some important properties that are useful to know. For example, only the ratio scale has meaningful zeros. A pie chart displays groups of nominal variables (i.e. categories).