Pressure Distribution and Heat Transfer for Flow Over Simulated Cylindrical Parachutes

1965 ◽  
Vol 87 (4) ◽  
pp. 521-525 ◽  
Author(s):  
J. C. Y. Koh ◽  
J. P. Hartnett
Keyword(s):  
Heat Transfer ◽  
Pressure Distribution ◽  
Free Stream ◽  
Turbulence Level ◽  
Heat Transfer Characteristics ◽  
Free Stream Turbulence ◽  
Transfer Characteristics ◽  
Cylindrical Cup

The aerodynamic and heat-transfer characteristics for flow over an upstream-facing cylindrical cup simulating a parachute geometry were studied. It was found that: (1) The pressure on the bottom of the cup increases as the depth of the cup increases. (2) An increase in the free-stream turbulence level increases the aerodynamic heat transfer significantly. (3) The heat transfer front the bottom of the cup decreases monotonically as the depth of the cup increases. (4) The effect of suction at the cup bottom is to equalize the pressure distribution and to increase the heat transfer.

An analysis of flow and heat transfer in separated flows over blocked surface

2012 ◽  
Vol 227 (3) ◽  
pp. 481-491
Author(s):  
O Yemenici ◽  
ZA Firatoglu
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Free Stream ◽  
Separated Flows ◽  
Stream Velocity ◽  
Transfer Enhancement ◽  
Heat Transfer Characteristics ◽  
Free Stream Turbulence ◽  
Intensity Measurements ◽  
Flow And Heat Transfer

The flow and heat transfer characteristics of flat and blocked surfaces were experimentally examined under the influence of the free stream velocity of 3, 5, 10 and 15 m/s encompassing laminar, transitional and turbulent flows. A constant-temperature hot wire anemometer was used for the velocity and turbulent intensity measurements, and copper-constant thermocouples and a micro-manometer for temperature and static pressures measurements, respectively. The flow over blocked surface separated in front of the first block and attached on it, then circulated between blocks, and then reattached behind the last block. The results showed that the flow separation before the first block occurred earlier in laminar–laminar separated–reattached flow than the transitional and turbulent flows and turbulent–turbulent separated–reattached flow leading to a shorter reattachment region with high free-stream turbulence. The presence of the separation and reattachment caused the heat transfer enhancement, which was more pronounced in the laminar flow and new empirical equations were developed for the local Stanton numbers.

Sign in / Sign up

Export Citation Format

Share Document