نتایج جستجو

s Δ T l m {\displaystyle q=h{{A}_{s}}\Delta {{T}_{lm}}} Δ T l m = ( T i − T s ) − ( T 0 − T s ) L n T i − T s T 0 − T s {\displaystyle \Delta {{T}_{lm}}={\frac...

q x = T ∞ , 1 − T s , 1 1 ╱ h 1 A = T s , 1 − T 2 L A ╱ k A A = T 2 − T 3 L B ╱ k B A = . . . {\displaystyle {{q}_{x}}={\frac {{{T}_{\infty ,1}}-{{T}_{s...

زیر بیابید. حل : q = K S Δ T S = 2 π D 1 − D 4 Z = 2 π ∗ 0.5 ( m ) 1 − 0.5 ( m ) 4 ∗ 1 ( m ) = 3.6 m ⇒ q = 0.2 ( w m . k ) ∗ 3.6 ( m ) ∗ 80 ( k ) = 57...

Q = 0.01 m 3 s D = 75 m m L = 100 m ρ w a t e r = 999 k g m 3 μ = 10 − 3 k g m . s {\displaystyle {\begin{aligned}&Q=0.01{\frac {{m}^{3}}{s}}\\&D=75mm\\&L=100m\\&{{\rho...

d Q d T {\displaystyle C={\frac {dQ}{dT}}} d T ( t ) d t = − r ( T ( t ) − T e n v ) = − r Δ T ( t ) {\displaystyle {\frac {dT(t)}{dt}}=-r(T(t)-T_{\mathrm...

مبنای T s {\displaystyle {{T}_{s}}} جدید حل می‌کنیم. q = q F . c + q N . c q F . c = m ˙ c p ( T o u t − T i n ) q N . c = h A s ( T s − T ∞ ) ⇒ T s = T ∞...

) ∴∵∴∵∴ Δ T l m = L M T D = ( T s − T i ) − ( T s − T o ) ln ⁡ T s − T i T s − T o → ( 1 ) & ( 2 ) T s − T i T s − T o = e A s h m ⋅ c p m ⋅ = ρ i V ∞...

m c d T d t = − h A s ( T − T ∞ ) + q T ∗ = T − T ∞ → d T ∗ d t + h A s m c T ∗ = q m c e h A s m c t ( d T ∗ d t + h A s m c T ∗ ) = e h A s m c t (...

{\partial T}{\partial x}}={\frac {d{T_{m}}}{dx}}\theta } که: d T m d x = 2 b q ″ w m ˙ C p = 2 b h ( T s − T m ) m ˙ C p → ∫ d T m T m − T s = − ∫ 2 b h m ˙ C...

b T m , n + 1 − T m , n Δ y q s = k Δ x b T m , n − 1 − T m , n Δ y ⇒ k Δ x Δ y [ T m + 1 , n − 2 T m , n + T m − 1 , n Δ x 2 + T m , n − 1 − 2 T m ,...

صورت زیر است: T=300[K] D=0.1[m] P=101[kpa] Nu=Mio/Den a=0.6 q=100[W] A_1=0.03[m^2] epsilon=0.2 T_f=(T_s+T)/2 Beta=1/T_f Ra=((g*Beta*(T_s-T_infinity)*(D^3))*Pr)/(Nu^2)...

زیر اگر Q = .233 f t 3 . s − 1 , S G = .86 , μ = 2 × 10 − 4 l b f . s . f t − 2 , ρ w = 62.4 l b m . f t − 3 {\displaystyle Q=.233f{{t}^{3}}.{{s}^{-1}}...

T s a t − T s ) 1 4 L ] 1 4 ( ∗ ) Re δ = 4 m ˙ μ l b m ˙ = q h ′ f g = h ¯ L A ( T s a t − T s ) h ′ f g h ¯ L = Re δ μ l h ′ f g 4 L ( T s a t − T s...

می‌دهیم): E t o t a l = U + m V 2 2 + m g z {\displaystyle {E_{total}=U+{\frac {mV^{2}}{2}}+mgz}} ( ∂ E ∂ t ) c . v = E ˙ i n − E ˙ o u t + Q ˙ − W {\displaystyle...

A ′ = 0 ; Z A = − 1 ; V A ′ = 0 ; P A ′ = P a t m V A = Q A = 1 ∗ 10 − 3 20 ∗ 10 − 4 = 0.5 m s P a t m ρ g + 0 2 g + 0 = P A ρ g + 0.5 2 2 g − 1 ⇒ P A...

( T s − T s a t ) = q s ″ {\displaystyle h({{T}_{s}}-{{T}_{sat}})={{q}_{s}}^{''}} که این اختلاف دما یعنی ( T s − T s a t ) {\displaystyle ({{T}_{s}}-{{T}_{sat}})}...

Q ∂ t = − k ∮ S ∇ → T ⋅ d S → {\displaystyle {\frac {\partial Q}{\partial t}}=-k\oint _{S}{{\overrightarrow {\nabla }}T\cdot \,{\overrightarrow {dS}}}}...

جرم: ( m ˙ ) i n = ( m ˙ ) o u t ⇒ Q = A o u t V o u t ⇒ V o u t = Q A o u t {\displaystyle ({\dot {m}})_{in}=({\dot {m}})_{out}\Rightarrow \;Q=A_{out}V_{out}\Rightarrow...

}_{s}}=.1,\varepsilon =.9} q n e t {\displaystyle {{q}_{net}}} خالص دریافتی را حساب کنید؟ q n e t = [ α G − ε σ ( T s 4 − T s k y 4 ) ] A A = 1 m {\displaystyle...

\;v_{out}A=(1000kg/m^{3})(1m/s)({\frac {\pi \;}{4}}0.1^{2}m^{2})=7.85398kg/s} m ˙ i n = 20 k g / s {\displaystyle {\dot {m}}_{in}=20kg/s} ∂ H ∂ t = m ˙ i n − m ˙ o u t ρ...