EFFECTS OF TURBULENCE PROMOTER ON FLOW IN T-JUNCTION PIPING SYSTEMS(T-junction and Cross Flow)

Nakajima, Naohiro; Hibara, Hideki; Muramatsu, Toshiharu; Tanaka, Masaaki; Iwamoto, Yukiharu; Ochi, Junji

doi:10.1299/jsmeicjwsf.2005.617

Cited by 2 publications

(2 citation statements)

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“…Among many possible options [13], we have adopted small jets as mixing promoters considering feasibility to the real HVAC unit and potential to promote and control the turbulence level. It should be noted that physical barriers such as rib-turbulators were also one of the options, and we tested two-dimensional ribs attached on the wall in the branch or main channel.…”

Section: Overview Of Velocity and Temperature Fields In Standard T-jumentioning

confidence: 99%

Promotion of Turbulent Thermal Mixing of Hot and Cold Airflows in T-junction

Hirota

Kuroki

Nakayama

et al. 2007

Flow Turbulence Combust

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An experimental study has been conducted on the promotion and control of turbulent thermal mixing of hot and cold airflows in a T-junction with rectangular cross sections, which simulates the HVAC unit for automobile air-conditioning system. In order to promote the turbulent thermal mixing, small jets have been blown into the main channel at the upstream edge of the T-junction in the direction of 45°against the main flow. Turbulence intensity in the upper part of the thermal mixing layer can be increased with these jets, and consequently the turbulent mixing of hot and cold airflows is promoted effectively. Moreover, it has been found that the degree of thermal mixing can be controlled by changing the jet velocity.

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Section: Overview Of Velocity and Temperature Fields In Standard T-jumentioning

confidence: 99%

Promotion of Turbulent Thermal Mixing of Hot and Cold Airflows in T-junction

Hirota

Kuroki

Nakayama

et al. 2007

Flow Turbulence Combust

View full text Add to dashboard Cite

show abstract

“…Moreover, the characteristics of the temperature field have been investigated as well. In particular, the temperature fluctuation near the channel wall has been examined to make clear the mechanism of the thermal striping phenomena that occur in a nuclear power plant (Kawamura et al, 2002;Igarashi et al, 2002;Fukushima et al, 2003;Yuki et al, 2004;Nakajima et al, 2005;Tanaka et al, 2005). In the application to the automobile HVAC unit, the heat transfer between the hot airflow and cold one is important, but few data are available on the detailed mechanism of heat transfer between two flows in a T-junction (Kok and van der Wal, 1996).…”

Section: Introductionmentioning

confidence: 99%