What is the correct answer?


Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number

B. Grashoff number & Reynolds number

C. Reynolds number

D. Grashoff number & Prandtl number

Correct Answer :

D. Grashoff number & Prandtl number

Related Questions

Pick out the wrong statement. One face of a furnace wall is at 1030°C and the other face is exposed… A dummy activity is used in PERT network to describe the Maximum amount of thermal radiation is emitted at all wavelengths at any… The most economical channel section for the fluid flow is the one for… In electrical resistance welding, distortion results from the use of improper Maximum consumption of limestone is in the __________ industry. Property responsible for the talcum powder to cling to the skin is the Use of flux during soldering is done to Fire in fuel gas pipelines is extinguished most effectively by Theoretical volume of oxygen required for complete combustion of 1Nm3… Viscoelastic behaviour is observed in __________ materials. Principal alloying elements of cast tool alloys which have very high wear… Principal alloying element in Elinvar (used for making hair springs for… A jig is used while __________ a hole. The ratio of thermal & electrical conductivity is same for all the metals… Nickel is a __________ material. Materials having __________ lattice structure are usually the most ductile. Globular form of cementite is formed during the __________ process. The softness or hardness of a grinding wheel depends upon the type & amount… Which of the following material handling equipments is not suitable for… The boiling & freezing points on a newly defined temperature scale in… Reduction in the grain size reduces the __________ of the material. Magnesium is present in Carnot cycle is also termed as the constant __________ cycle in thermodynamics. Addition of small amount of __________ to grey cast iron is done to produce… __________ pipe is the most suitable for carrying sanitary drainage. __________ is not a case hardening process. Which of the following is not categorised as the ore agglomeration process? Cold working of a material results in increase in hardness, which is termed…