Perforated sheet with hexagonal holes!?

oj.bulmer · April 10, 2013, 10:35

Hi

I want some good literature on performance of perforated sheet with hexagonal holes. While Idelchik's "Handbook of Hydraulic Resistance" has abundant information about circular hole patterns, it has no mention of hexagonal holes.

Entire day of searching and I could stumble upon just two references. One is a published paper claiming hexagonal holes produce smaller pressure drop than circular ones, and other is a patent (yea, I have to search patents now, in the absence of literature

) which claims the velocity distribution for hex holes is smooth etc.

I want some good literature beforehand that gives resistance coefficients $\left( \zeta =\frac {\Delta P} {\frac{1}{2} \rho v^2} \right)$ for different percentages of open areas and thickness to hole diameter ratio etc, or at least something. I can always do a unitary cell symmetric arrangement of hexagonal hole to understand the characteristics, but it is time consuming and it is not possible to cover all types of perf sheets in limited time.

Thanks
OJ

Paulh · April 10, 2013, 15:07

Have you checked the chapter on Duct Design in ASHRAE's Fundamentals?

oj.bulmer · April 11, 2013, 05:07

I did look through Chapter 21 - Duct Design (ASHRAE Fundamentals, 2009), but there are only two mentions of screens, and they are pretty simplistic - with rectangular opening. I searched through all the chapters as well, with no luck.

I hope there is some work done earlier on perforated sheets with hexagonal openings. Even any published work on hexagonal orifices for that matter would be helpful, as I can always extrapolate understanding on Perf physics.

Thanks
OJ

April 10, 2013, 10:35	Perforated sheet with hexagonal holes!?	#1
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	Hi I want some good literature on performance of perforated sheet with hexagonal holes. While Idelchik's "Handbook of Hydraulic Resistance" has abundant information about circular hole patterns, it has no mention of hexagonal holes. Entire day of searching and I could stumble upon just two references. One is a published paper claiming hexagonal holes produce smaller pressure drop than circular ones, and other is a patent (yea, I have to search patents now, in the absence of literature ) which claims the velocity distribution for hex holes is smooth etc. I want some good literature beforehand that gives resistance coefficients $\left( \zeta =\frac {\Delta P} {\frac{1}{2} \rho v^2} \right)$ for different percentages of open areas and thickness to hole diameter ratio etc, or at least something. I can always do a unitary cell symmetric arrangement of hexagonal hole to understand the characteristics, but it is time consuming and it is not possible to cover all types of perf sheets in limited time. Thanks OJ

April 10, 2013, 15:07	Perforated sheet with hexagonal holes!?	#2
Paulh Member Paul Hancock Join Date: Mar 2009 Location: Bellingham, WA Posts: 31 Rep Power: 17	Have you checked the chapter on Duct Design in ASHRAE's Fundamentals?

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April 11, 2013, 05:07		#3
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	I did look through Chapter 21 - Duct Design (ASHRAE Fundamentals, 2009), but there are only two mentions of screens, and they are pretty simplistic - with rectangular opening. I searched through all the chapters as well, with no luck. I hope there is some work done earlier on perforated sheets with hexagonal openings. Even any published work on hexagonal orifices for that matter would be helpful, as I can always extrapolate understanding on Perf physics. Thanks OJ