5 examples of heat transfer through conduction

... Journal of Heat and Mass Transfer1 999; 42: 159 7-16 15 [16] Karwa R, Experimental studies of augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated ... Investigation of heat transfer and friction for ribroughened surfaces, Int Journal of Heat & Mass Transfer 1978; 21: 1143-1 156 [4] Webb R.L., Eckert E.R.G and Goldstein R J Heat transfer and friction ... Journal of Heat Mass Transfer 2003; 30(2): 241- 250 [17] Bhagoria J.L and Sahu M.M Augmentation of heat transfer coefficient by using 900 broken transverse ribs on absorber plate of solar air heater,

Ngày tải lên: 05/09/2013, 16:10

... 50 52 54 56 MD simulation Finite Difference t= 15 ps Temperature (K) 50 52 54 56 MD simulation Finite Difference t=20 ps 50 52 54 56 MD simulation Finite Difference t= 25 ps 50 52 54 56 ... 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t =5 ps 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t=10 ps /m 3 ) 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t= 15 ps of Atoms (10 29 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t=20 ps Number ... Number Density 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t= 25 ps 0.00 0. 25 0 .50 0. 75 1.00 1. 25 3 5 7 9 11 13 15 17 t=30 ps z (nm) Figure 6. Distribution of number density of atoms at different times

Ngày tải lên: 06/05/2014, 08:55

... 50 52 54 56 MD simulation Finite Difference t= 15 ps Temperature (K) 50 52 54 56 MD simulation Finite Difference t=20 ps 50 52 54 56 MD simulation Finite Difference t= 25 ps 50 52 54 56 ... 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t =5 ps 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t=10 ps /m 3 ) 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t= 15 ps of Atoms (10 29 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t=20 ps Number ... Number Density 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t= 25 ps 0.00 0. 25 0 .50 0. 75 1.00 1. 25 3 5 7 9 11 13 15 17 t=30 ps z (nm) Figure 6. Distribution of number density of atoms at different times

Ngày tải lên: 06/05/2014, 08:57

... 50 52 54 56 MD simulation Finite Difference t= 15 ps Temperature (K) 50 52 54 56 MD simulation Finite Difference t=20 ps 50 52 54 56 MD simulation Finite Difference t= 25 ps 50 52 54 56 ... 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t =5 ps 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t=10 ps /m 3 ) 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t= 15 ps of Atoms (10 29 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t=20 ps Number ... Number Density 0.00 0. 25 0 .50 0. 75 1.00 1. 25 t= 25 ps 0.00 0. 25 0 .50 0. 75 1.00 1. 25 3 5 7 9 11 13 15 17 t=30 ps z (nm) Figure 6. Distribution of number density of atoms at different times

Ngày tải lên: 06/05/2014, 08:59

... ⎞ C = 0 .53 8 ⎜ i ⎟ ⎝ Lc ⎠ ⎛D ⎞ C = 3 .54 ⎜ i ⎟ ⎝ Lc ⎠ − 0.44 − 0.44 ⎛ Di ⎞ ⎜ ⎟ ⎝ Le ⎠ ⎛ Di ⎞ ⎜ ⎟ ⎝ Le ⎠ 0 .55 ψ 0.13 for ψ ≤ 0. 35 (17) 0 .55 ψ −0.37 for ψ 0. 35 3. Description of experiments ... (IJEE), Volume 5, Issue 4, 2014, pp.4 95- 504 50 1 Noie [10] investigated the heat transfer coefficient of evaporator of a two phase closed thermosyphon versus the average temperature of evaporator ... shows the experimental data of Noie [10] for heat transfer coefficient of evaporator. Figure 5. Heat transfer coefficient of evaporator versus average temperature of evaporator surface for different

Ngày tải lên: 09/09/2015, 10:32

... LC are the rates of heat- transfer supplied by the heat source and released to the heat sink by the working fluid, respectively; Q H and Q L are the real rates of heat- supply and heat- release, respectively. ... Carnot heat engine of the same heat input, the generalized irreversible Carnot engine can deliver less power and release more heat to the heat sink. Hence, the rate of heat flow ( QLC ) to the heat ... irreversible Carnot heat engine cycle model Assuming the rates of the heat flow in the heat- exchangers follow the generalized radiative heat transfer law, q ∝ ∆(T n ) , where n is a heat transfer exponent,

Ngày tải lên: 09/09/2015, 10:32

... F5 F1 F2 F3 F4 F5 PF1 PF2 PF3 PF4 PF5 PF6 Age 28 28 Foam content (%) 50 70 25 50 50 50 70 25 50 50 50 50 50 50 20 80 𝒌𝒔 at 298. 15 K [ 25? ??] 0.4948 0.4948 0.4948 0 .55 71 0. 458 7 0 .53 45 0 .53 45 0 .53 45 ... Experiment Percentage of error Mean temperature 308. 15 K 318. 15 K 323. 15 K [ 35? ?C] [ 45? ?C] [50 °C] 0.0339 0.0 350 0.0 355 0.0343 0.0 352 0.0 358 1.18% 0 .57 % 0. 85% Table B.2 Repeatability of the guarded-hot-plate ... 298. 15 [ 25] 298. 15 [ 25] 3 .52 19.6 307.4 [34.2] 52 .13667 298. 15 [ 25] 298. 15 [ 25] 3 .52 19.3 307.6 [34 .5] 51 .99391 K/m 777.64918 764.01 259 K/m 762.41124 753 . 353 82 W/mK 0.033 85 0.03427 1.24% 162 Appendix

Ngày tải lên: 10/09/2015, 15:47

... SIMULATIONS OF HEAT TRANSFER OF HOT-WIRE ANEMOMETER LI WENZHONG (M.Eng. NUAA) A THESIS SUBMITTED FOR THE DEGREE OF PHILOSOPHY OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING NATIONAL UNIVERSITY OF ... 146 5. 4 Heat transfer characteristics of the hot wire in free stream fluctuating flow …………………………………………………………………………….147 5. 5 Conclusions . 155 ... corrections of single hot-wire measurements. Int. J. Heat and Fluid Flow. 16, 471-476. Cole, J. and Roshko, A. 1 954 Heat transfer from wires at Reynolds numbers in the Oseen range. Proc. Heat Transfer

Ngày tải lên: 16/09/2015, 17:14

... 1.164 1 .55 2 0.388 0.776 1.164 1 .55 2 47. 75 54.20 58 . 35 60. 05 46 .55 51 .00 55 .50 60. 25 83.00 88.00 94 .50 94 .50 84.00 87 .50 92 .50 94 .50 53 .00 66 .50 74.00 78.00 59 .00 71.00 78.00 81 .50 35. 50 35. 20 35. 00 ... 1 .55 2 34. 05 34. 05 35. 55 36.20 38. 85 37. 85 41 .55 42.70 87.00 88.00 87.00 95. 00 88.00 89 .50 86 .50 99.00 67 .50 86.00 79.00 71.00 60.00 84 .50 76 .50 69.00 22. 05 21. 65 20 .55 20. 25 21. 65 21.10 21.00 20.40 ... 35. 00 12:00 37.00 13:00 38 .50 14:00 39.20 15: 00 39.10 16:00 38 .50 43.10 53 .70 63.70 67 .50 70.10 69.20 66.70 64.70 25. 00 29.40 30 .50 32 .50 30.60 34 .50 31.80 30.80 417 57 0 6 75 740 753 684 617 58 0

Ngày tải lên: 13/01/2020, 11:50

... ‘thermal short’ conducting heat through the ceiling more quickly than the surrounding fiberglass (b) The rate of heat transfer through the ceiling is q ΔT 22°C − (? ?5? ?C) = = = 13 .5 W/m2 A RFc 2.0 m K/W ... thermal conductivity of silicone is 150 W/(m K) GIVEN • • • • A 0.007 m by 0.007 m silicone chip Thickness of the chip (L) = 0 .5 mm = 0.00 05 m Heat generated at the back of the chip ( qG ) = ... for Principles of Heat Transfer 7th Edition by Kreith Full file at https://TestbankDirect.eu/ SKETCH mm m 7m CNIP 0 .5 Substrate SOLUTION For steady state the rate of heat loss through the chip,

Ngày tải lên: 21/08/2020, 09:48

... rate of heat transfer by conduction through the skin must be equal to the total rate of heat transfer, therefore Tso = Tsi – Tsi L K T hc L k Solving this for still air (Tso)still air = 35? ?C – 35o ... temperature of the sphere A calculation of the total rate of heat transfer to the sphere would have to take the rate on condensation and the rate of radiative heat transfer into account 25 © 2018 ... surfaces of the chip The thermal conductivity of silicone is 150 W/(m K) GIVEN     A 0.007 m by 0.007 m silicone chip Thickness of the chip (L) = 0 .5 mm = 0.00 05 m Heat generated at the back of

Ngày tải lên: 21/08/2020, 13:29

... 4 35. 107 13. 455 18.791 40397 1 1e- 05 75. 57 7 432.3 35 13 .52 9 19. 658 160797 1 1e- 05 257 .394 4946.968 36.720 35. 436 10197 1 5e- 05 287.3 75 4880.108 44.2 95 49.2 35 40397 5 5e-06 ... 10e-3 1e-04 5 3 154 1e-4 15 3 259 5e- 05 51 3706 8.44e-6 5 159 0 1e-4 14 1244 5e- 05 43... 5e- 05 43 4090 1.06e -5 10e-2 1e-te04 106 1 1e-04 4 55 27 1e-4 14 56 08 1e- 05 283 144089 ... 211.67 61 .55 15. 91 (d) 1 95. 98 0.0 45 63.73 0. 850 6.1 15. 15 1677 219.48 0.038 64.87 0. 851 7.67 16.13 655 7 221.37 0.039 65. 91 0.860 8.97 16 .51 10197 7 10 687.43 0.023 1 45. 68 0.888 16 .59 28.23

Ngày tải lên: 19/06/2014, 10:20

... 4 35. 107 13. 455 18.791 40397 1 1e- 05 75. 57 7 432.3 35 13 .52 9 19. 658 160797 1 1e- 05 257 .394 4946.968 36.720 35. 436 10197 1 5e- 05 287.3 75 4880.108 44.2 95 49.2 35 40397 5 5e-06 ... 10e-3 1e-04 5 3 154 1e-4 15 3 259 5e- 05 51 3706 8.44e-6 5 159 0 1e-4 14 1244 5e- 05 43... 5e- 05 43 4090 1.06e -5 10e-2 1e-te04 106 1 1e-04 4 55 27 1e-4 14 56 08 1e- 05 283 144089 ... 211.67 61 .55 15. 91 (d) 1 95. 98 0.0 45 63.73 0. 850 6.1 15. 15 1677 219.48 0.038 64.87 0. 851 7.67 16.13 655 7 221.37 0.039 65. 91 0.860 8.97 16 .51 10197 7 10 687.43 0.023 1 45. 68 0.888 16 .59 28.23

Ngày tải lên: 21/06/2014, 01:20

... = = 68, 55 2 Re D = ν 7 25 × 10−6 N ⋅ s m 2 994 kg m3 0.62 ( 68, 55 2 ) 1/ 2 Nu D = 0.3 +  ( 4. 85 )1/ 3   1+ 1/ 4 1 + ( 0.4 4. 85 )2 / 3        5 / 8 4 / 5 68, 55 2   ... t (s) Ts (t), (°C) h L (W/m2⋅K) Nu L 3 9 100 50 44.77 45. 80 30.81 56 .7... T(K) 600 55 0 50 0 450 400 350 300 0 50 100 150 200 250 300 Time, t(s) Without radiation With radiation, eps = ... 000 ... m/s and ≤ 50 s when u ∞ = 5 m/s) 60 Temperatures, Ts (C) ln(theta/thetai) 0 -1 -2 50 40 30 0 50 100 150 200 250 300 0 50 100 Elapsed time, t (s) 150 200 250 300 Elapsed time,

Ngày tải lên: 08/08/2014, 17:20

... 10% 0 4 6 8 10 5 10 Nu/Nu0 10 9.2 8.4 7.6 6.8 6 5. 2 4.4 3.6 2.8 2 1.2 2 4 Z 2 Z 0 Nu/Nu0 7 .5 7 6 .5 6 5. 5 5 4 .5 4 3 .5 3 2 .5 2 1 .5 0 15 X 6 8 10 15. .. geometry of the protrusions ... 10 10 Nu/Nu0 10 9.2 8.4 7.6 6.8 5. 2 4.4 3.6 2.8 1.2 10 15 10 X X (c) 15% (d) 20% 15 Nu/Nu0 11 10 Z 15 Nu/Nu0 7 .5 6 .5 5 .5 4 .5 3 .5 2 .5 1 .5 4.6 4.2 3.8 3.4 2.6 2.2 1.8 1.4 ... significantly to heat transfer from the wall to the fluid downstream 0 4 6 8 u 4 .5 3 .5 2 .5 1 .5 0 .5 -0 .5 -1 .5 2 4 Z 2 Z 0 u 9 8 7 6 5 4 3 2 1 0 -1 6 8 10 10 0 5 10 15 0 5 10 X (a)

Ngày tải lên: 10/09/2015, 09:11

... Two important conditions for modelling a heat transfer process are the law of heat transfer on the boundary of the object and heat sources generated heat conduction These conditions are generated ... Learning Resource Center of Thai Nguyen University - Library of the College of Education – Thai Nguyen University Introduction The process of heat transfer or diffusion are often modelled by boundary ... to the heat transfer coefficient σ(u) However, to limit the length of the thesis, we will not present the numerical results of this case Chapter Determination of the sources in heat conduction

Ngày tải lên: 16/01/2020, 04:19

... Foundation All rights reserved  758 International Journal of Energy and Environment (IJEE), Volume 1, Issue 5, 2010, pp. 757 -768 heat transfer past a vertical porous plate through a porous medium under ... and the rate of heat transfer are discussed with the help of figures and tables Copyright © 2010 International Energy and Environment Foundation - All rights reserved Keywords: Heat transfer, Periodic ... convective flow and heat transfer through a porous medium with periodic permeability Chauhan and Sahal [13] analyzed the flow and heat transfer over a naturally permeable bed of very small permeability

Ngày tải lên: 05/09/2013, 14:58

... generalized heat transfer law including generalized convective heat transfer law and generalized radiative heat transfer law has been derived [11]. The heating load and coefficient of performance of a ... capacities of a working fluid [6], to obtain the optimal expansion of a heated working fluid with convective radiative heat transfer [7] and to investigate the effects of variable specific heat ratio of ... (5) where A is the heat transfer area, h is the convection heat transfer coefficient between the working fluid and the reservoir, and t is the time of releasing heat process. The radiation heat

Ngày tải lên: 05/09/2013, 15:28

... Remarks 52 5 References 52 7 Problems 52 9 Design Problems 53 9 Chapter 9 Heat Transfer by Radiation 54 0 9.1 Thermal Radiation 54 1 9.2 Blackbody Radiation 54 3 9.3 Radiation Properties 55 5 9.4 The ... Basic Modes of Heat Transfer 2 1.1 The Relation of Heat Transfer to Thermodynamics 3 1.2 Dimensions and Units 7 1.3 Heat Conduction 9 1.4 Convection 17 1 .5 Radiation 21 1.6 Combined Heat Transfer ... Thermal Insulation 45 1.8 Heat Transfer and the Law of Energy Conservation 51 References 58 Problems 58 Design Problems 68 Chapter 2 Heat Conduction 70 2.1 Introduction 71 2.2 The Conduction Equation...

Ngày tải lên: 08/04/2014, 11:00

... 2339 .51 1 -2246 W-01 837.871 2270 .59 5 -2 250 W-02 428.004 2118. 255 -2271 W-03 859 .634 1878.863 -2272 W-04 181. 357 151 9.776 -2292 W- 05 1940 .52 5 2187.171 -2277 W-06 2738.498 2292. 358 -2 255 W-07 ... map of the new snow thickness is obtained (see figure 5. 5b). Fig. 5. 5b: Thickness of the new snow layer. It is obvious from figure 5. 5b that snow also increased outside the assumed boundary of ... W-07 2981 .51 7 23 75. 783 -2238 W-08 3344.232 9 35. 8 05 -2338 W-09 2121.882 812.481 -2317 W-10 493.292 50 0 .54 7 -2309 W-11 151 9.776 1733.777 -2267 W-12 3663.421 2143.6 45 -2264 W-13 2999. 652 2172.662...

Ngày tải lên: 21/01/2014, 07:20