An integrated approach has been employed to characterize the flow field and heat transfer configuration, in witch air jets undergoes to regime transition. Heat/mass transfer analogy has been used to infer the local heat exchange. A naphthalene film is ablated from the substrate disk, due to jet exposure, and from the local naphthalene loss rate the local heat transfer is then inferred. Under natural conditions the investigated impinging jet is substantial laminar and coherent structures are created upon excitation with acoustical perturbations and need to be investigated in the jet vicinity. Two laser techniques are employed: Laser Döppler Velocimetry (LDV) and Particle Image Velocimetry (PIV). Both techniques have been used in order to investigate the influences and coherent structures generated in the jet by acoustic perturbation forced in the flow. With the acoustical perturbation a substantial increase of the local heat transfer coefficient was observed.

Evaluation of Local Heat Transfer and Visualization of an Impinging Jet Acoustically Perturbed

DI TOMMASO, Rocco Mario;NINO, Enrico
2005-01-01

Abstract

An integrated approach has been employed to characterize the flow field and heat transfer configuration, in witch air jets undergoes to regime transition. Heat/mass transfer analogy has been used to infer the local heat exchange. A naphthalene film is ablated from the substrate disk, due to jet exposure, and from the local naphthalene loss rate the local heat transfer is then inferred. Under natural conditions the investigated impinging jet is substantial laminar and coherent structures are created upon excitation with acoustical perturbations and need to be investigated in the jet vicinity. Two laser techniques are employed: Laser Döppler Velocimetry (LDV) and Particle Image Velocimetry (PIV). Both techniques have been used in order to investigate the influences and coherent structures generated in the jet by acoustic perturbation forced in the flow. With the acoustical perturbation a substantial increase of the local heat transfer coefficient was observed.
2005
9784944068753
File in questo prodotto:
File Dimensione Formato  
P_056.pdf

non disponibili

Tipologia: Abstract
Licenza: DRM non definito
Dimensione 641.13 kB
Formato Adobe PDF
641.13 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/17115
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact