تم الحل ✓
categoryالهندسة الميكانيكية
schoolبكالوريوس
event_available2026-07-15
السؤال
Transcribed Image Text:
Moving to the next question prevents changes to this answer.
estion 2
Water at 298 K is parallel flow over a stainless steel wall that is 0,05 m thick. The surface temperature of the was
Determine the convection heat transfer coefficient in W/(m^2*K) using the following information.
Assume the thermal conductivity of the stainless steel wall is 17.3 W/(m K) and the thermal conductivity of wall
Formula Sheet
Conduction:
General (vector) form of Fourier's law
=-kVT
Heat flux Thermal conductivity
Temperature gradient
W/m²
W/m-K
°C/m or K/m
9=-k-
dT T-T
=-k-
dx
L
Newton's law of cooling:
q=h(T-T)
h: Convection heat transfer coefficient (W/m²-K)
Energy outflow due to
(1.3a)
MacBook Air
s to this answer.
Question 2 of
10 points
teel wall that is 0.05 m thick. The surface temperature of the wall in contact with water is 313 K and its other surface temperature is 373 K
ient in W/(m^2*K) using the following information.
ess steel wall is 17.3 W/(m K) and the thermal conductivity of water is 0.632 W/(m K).
ormula Sheet
ourier's law
=-kVT
mermal conductivity
W/m-K
°C/m or K/m
Temperature gradient
dT
=-k
T-T
=-k
dx
L
ng:
q"=h(T-T)
(1.3a)
(W/m²K)
on Completion Status:
TABLE 7.7 Summary of convection heat transfer correlations for external flow.
Correlation
5 = 5x Re 1/2
(7.19)
Geometry
Flat plate
Conditions
Laminar, T,
C = 0.664 Re
(7.20)
Flat plate
Laminar, local, T
Nu, = 0.332 Re Pr
1/2
(7.23)
Flat plate
Laminar, local, Ty, Pr≥ 0.6
8₁ = 8 Pr13
(7.24)
Flat plate
Laminar, T
Cfx = 1.328 Re
(7.29)
Flat plate
Laminar, average, T
TABLE 7.7 (Continued)
Correlation
Geometry
Conditions
=
Nu, 0.664 Re P
(7.30)
Flat plate
Laminar, average, T. Pr≥ 0.6
Nu, = 0.564 Pe
1/2
(7.32)
Flat plate
Laminar, local, Ty, Pr≤ 0.05, Pe
Cf.x
= 0.0592 Res
(7.34)
Flat plate
Turbulent, local, T, Re, 10
6 = 0.37x Re
(7.35)
Flat plate
Turbulent. T,, Re, 10
Nu,
=0.0296 Res P
(7.36)
Flat plate
Turbulent, local, T, Re, ≤ 10'.
0.6 Pr≤ 60
TJ.L
=0.074 Re-1742 Re
(7.40)
Flat plate
=
Nu, (0.037 Re- 871) Pr
(7.38)
Flat plate
Nup = CRe Pr
(7.52)
Cylinder
(Table 7.2)
=
Nup C Reg Pr' (PriPr)4
(7.53)
Cylinder
Mixed, average, T. Re, 5x 10
Re 10
Mixed, average, T, Re, 5x 10
Re 10, 0.6 Pr≤ 60
Average. 7, 0.4 Rep 4x10
Prz 0.7
Average, T. 1 Rep≤ 10.
0.7 Prs 500
(Table 7.4)
MacBook Air
check_circle الجواب — حل مفصل خطوة بخطوة
hourglass_top
🔒
الحل الكامل متاح للمشتركين
اشترك في أرشيف الأسئلة لعرض هذا الحل وآلاف الحلول المفصلة خطوة بخطوة من معلمين معتمدين.