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When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
In free convection heat transfer, Nusselt number is function of
Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
Nusselt number (for forced convection heat transfer) is a function of the __________ number.