Greetings! and Thanks for the ideas!
As the main reason here is "reducing" the cockpit noise, I did a rough mapping of the surface area which is subjected to RAF. Please note that I have based the BS & WL as per to the 737-100/200 AMM
pls refer the image above
A - This is the lateral area - total length of the two No.1 windshields (about 66.14 inches)
B - The hypotenuse is the length of the over nose area + little over the eye brow windows
BS 130 is at the start of nose radome and the BS 259.50 is at the very end of the window No.3 (129.5 inches)
The height is from the WL 208.1 to the top of the fuselage which is at WL 306.5. Since I did not have the information (at this time) the WL that intersect the BL 259.50, I assumed it and calculated about 80% from the WL 208.1, which is 78.7 inches.
The hypotenuse = 151.5 inches
C - is the calculation of the area in 3D space. The pink area is the upper lobe area of the fuselage which meets the RAF before anything! which is about 10059 square inches (about 69.8 square feet)
The green area is the area behind the 10 VGs, which "I" think is subjected for the noise reduction! assuming the green area is about 50% of the pink, which comes to about 5029.8 square inches (about 35 square feet) - please let me know if I have missed anything or have miss-calculated anything!, I will correct it and re-post the image.
Hens what is the practical / technical / aerodynamic answer for Boeing's theory of reducing cockpit noise by placing 10VGs effecting an area of about 35 square feet ? And why other airliners such as (direct comparable) A320 family, Embraer 190 series, Bombadier CRJs and hand full of other's don't have it ?