What value of reynold’s number represents a laminar flow?

1.	What value of reynold’s number represents a laminar flow?
A.	3
B.	2500
C.	5000
D.	78
Answer» E.

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Which of the following is correct about Reynold’s number?a) 3less thanNreless than1200b) 3less thanreless than1600c) 25less thanreless than1200d) 8less thanreless than1200Answer: dExplanation: 8less thanreless than1200 are the correct boundary conditions for Reynold’s number.advertisement/**/ var adpushup = adpushup || {}; adpushup.que = adpushup.que || []; adpushup.que.push(function() { adpushup.triggerAd("fdd9bf87-4faf-4493-82b4-e5538b31931a"); });/**/ 6. Prandtl’s number is the ratio of which two quantities?a) Momentum conductivity and thermal conductivityb) Coefficient of convection to thermal conductivityc) Momentum diffusivity and thermal diffusivityd) Interfacial force and viscous forceAnswer: cExplanation: Prandtl’s number is the ratio of Momentum diffusivity and thermal diffusivity.7. Which of the following is true about prandtl’s number?a) Npr = Cpµ/kb) Npr = Cpk/µc) Npr = Cvµ/kd) Npr = CpµAnswer: aExplanation: Prandtl’s number is the ratio of Momentum diffusivity and thermal diffusivity. Hence the formula is Npr = Cpµ/k. advertisement/**/ var adpushup = adpushup || {}; adpushup.que = adpushup.que || []; adpushup.que.push(function() { adpushup.triggerAd("21eae76a-c83f-42b0-aec5-01d590a53f37"); });/**/8. What is the physical significance of nusselt’s number?a) Ratio of convective heat transfer to conductive heat transferb) Ratio of convective heat transfer to conductive heat transferc) Ratio of total heat transfer to conductive heat transferd) Ratio of total transfer to convective heat transferAnswer: cExplanation: Nusselt number is the Ratio of convective heat transfer to conductive heat transfer.9. What is the correct formula for nusselt’s number?a) hµ/kb) hρ/kc) hL/kd) hΔTL/kAnswer: cExplanation: The nusselt number hL/k is the ratio of total heat transfer to onductive heat transfer.advertisement/**/ var adpushup = adpushup || {}; adpushup.que = adpushup.que || []; adpushup.que.push(function() { adpushup.triggerAd("90f55663-effd-4105-b1e7-29d86b526544"); });/**/10. Which of the following is most true?a) Na = kcA(cai – ca)b) Na = kcAΔcc) Na = kcA(cai – ca)meand) Na = kcA(cai – c
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What value of reynold’s number represents a laminar flow?

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