Discussion :: Heat Transfer, Refrigeration and Air Conditioning - Section 1 (Q.No.4)
- «« Heat Transfer, Refrigeration and Air Conditioning - Section 1
- Heat Transfer, Refrigeration and Air Conditioning - Section 2
- Heat Transfer, Refrigeration and Air Conditioning - Section 3
- Heat Transfer, Refrigeration and Air Conditioning - Section 4
- Heat Transfer, Refrigeration and Air Conditioning - Section 5
- Heat Transfer, Refrigeration and Air Conditioning - Section 6
- Heat Transfer, Refrigeration and Air Conditioning - Section 7
- Heat Transfer, Refrigeration and Air Conditioning - Section 8
| Sai Rama Prabhakar said: (Jun 7, 2013) | |
| In free convection the two dimensionless numbers are grashof's number & prandtl number where it is replaced by reynold's number & prandtl number for forced convection. | |
| Sanju said: (Nov 11, 2013) | |
| In free convection h is function of Pr number and Gr number. In forced convection h is function of Pr number and Re number. |
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| Sudheer said: (Jun 23, 2015) | |
| In free convection the two dimensionless numbers are Grashof's number & Prandtl numberwhere it is replaced by Reynold's number & Prandtl number for forced convection. In free convection h is function of Pr number and Gr number. Prandtl number, Grashoff's number. In forced convection h is function of Pr number and Re number. |
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| Sai Krishna said: (Jul 15, 2015) | |
| Would you please explain me Reynold's number, Grashof's number and Prandtl number? | |
| Rohit said: (Oct 1, 2015) | |
| Reynolds number = Re = Inertia forces/Viscous forces. Re = VD/v or (rho*V*D)/mu. Prandtl number = hl/k. Grashoff's number = (rho*g*B*l2*dt3)/mu. |
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| Ayyappa said: (Oct 27, 2015) | |
| In free convection Reynold's number matters. It is simply function of Grashoff's and prandtl. | |
| Amulraj said: (Apr 2, 2016) | |
| Refer heat and mass transfer data book CP Kothandraman. It contains all the formulas and relations. | |
| Gaurav said: (Dec 16, 2017) | |
| Critical value in free convection is Grashoff number only. Nusselt number is a function of GR No and PR No. So the answer should be B. |
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| Sreerag said: (Dec 24, 2017) | |
| @Rohit. I think Prandtl no = meu. Cp/k. |
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| Jonty said: (Aug 6, 2018) | |
| In free convection Nusselt number is a function of Re and Gr, on the other hand it is a function of Re and Pr for forced convection. So, answer C is correct. | |
| Kadam Vishal said: (Oct 8, 2018) | |
| According to me, Option A is also correct. | |
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