%0 Journal Article %A Pal, Tarun Kanti %A Chattopadhyay, Himadri %A Mandal, Dipak Kumar %D 2019 %I Begell House %K heat transfer, impingement, numerical methods, annular jet, laminar flow, turbulent flow %N 3 %P 199-209 %R 10.1615/InterJFluidMechRes.2018018422 %T FLOW AND HEAT TRANSFER DUE TO IMPINGING ANNULAR JET %U https://www.dl.begellhouse.com/journals/71cb29ca5b40f8f8,459c3ebb08635c38,257fe1e51190f4d1.html %V 46 %X It is well known that significant numbers of investigations have studied impinging circular jets; relatively fewer studies have dealt with annular jets. In this work, numerical investigations predict the transport phenomena and Nusselt number distribution of laminar-turbulent annular jets on a surface due to impingement. For analysis purposes, the annular jet characteristics are compared with a circular jet at the nozzle exit with the same Reynolds number and the same amount of mass and momentum efflux. The Reynolds number is defined on the basis of the width of the annular part of the jet. It was found that heat transfer from the annular jet was 20%–30% less than for the circular jet. The peak heat transfer zone is observed downstream of the annular ring. This location moves downstream as the Reynolds number increases. The skin friction pattern shows a similar trend. The nature of distribution of the Nusselt number over the impinging surface scales with Re0.54 for the laminar region and with Re0.66 for the turbulent region. %8 2019-04-25