heat transfer considerations a zero dimensional analysis

... 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 with a variable suction Das ... dependant temperature and concentration was studied by Sattar [9] Hayat et al [10] have analyzed the periodic unsteady flow of a non-Newtonian fluid The unsteady MHD convective heat transfer past ... Rate of heat transfer The rate of heat transfer at the wall i.e the heat flux in terms of Nusselt number N u for different values of α and K p are entered in Table 2 The heat flux at the wall

Ngày tải lên: 05/09/2013, 14:58

... temperatures This increase is enabled by advances in two areas,cooling technology and materials With cooling, inlet temperatures can far exceed allowablematerial temperatures Trang 3A widely ... nonlinear equations that results from the aforementioned approximations to the space- and time-derivatives are analyzed by using a diagonalized alternating-directionscheme (Pulliam & Chaussee (1981)) ... starts on the trailing face, gastemperature near that face is lower than that near the leading face (Fig 6) With higher temperature and hence lower density near the leading face, centrifugalbuoyancy

Ngày tải lên: 19/10/2022, 03:05

... 2011; Bhattacharyya, 2011a; 2011b; 2011c; Yacob et al., 2011; Bhattacharyya and Pop, 2011; Bhattacharyya, 2011d; 2011e; Ishak et al., 2012; Bhattacharyya and Vajravelu, 2012; Bhattacharyya et al., ... effects on boundary layer stagnation-point flow and heat transfer towards a shrinking sheet – Int J Heat Mass Transfer, vol.54, pp.308-313 Bhattacharyya K., Mukhopadhyay S., Layek G.C and Pop I (2012): ... 9Bhattacharyya K and Layek G.C (2011): Effects of suction/blowing on steady boundary layer stagnation-point flow and heat transfer towards a shrinking sheet with thermal radiation – Int J Heat

Ngày tải lên: 19/11/2022, 11:49

... nonlin-ear differential equation of heat and mass transfer equation of steady laminar flow of a micropolar fluid along a two-dimensional channel with porous walls Comparisons have been done among AGM and ... are applied on Eqs.(31)Ờ(34); in the following form: fđ1ỡ Ử 0 ! a9ợ a8 a7ợ a6 a5ợ a4 a3 fđợ1ỡ Ử 0 ! a9ợ a8ợ a7ợ a6ợ a5ợ a4 f0đ1ỡ Ử 0 ! 9a9 8a8ợ 7a7 6a6ợ 5a5 4a4 f0đợ1ỡ Ử 1 ! 9a9ợ 8a8ợ ... R.A., Abo-Dahab, 2009 Influence of chemical reaction and thermal radiation on the heat and mass transfer in MHD micropolar flow over a vertical moving porous plate in a porous medium with heat

Ngày tải lên: 04/12/2022, 16:23

... (SIMPLE GAS REFRIGERATION CYCLE) Trang 13THERMODYNAMICS & HEAT TRANSFER – CHAPTER 1212.5 VÍ DỤ 13 Trang 1412.5 VÍ DỤTrang 15THERMODYNAMICS & HEAT TRANSFER – CHAPTER 1212.5 VÍ DỤ 15 Trang ... s 1 = s 2 Van tiết lưu (Expansion valve) i 3 = i 4 3 4 Trang 7THERMODYNAMICS & HEAT TRANSFER – CHAPTER 1212.3 CHU TRÌNH THIẾT BỊ LÀM LẠNH BẰNG HƠI 7  MÔI CHẤT LẠNH (REFRIGERANTS)  Là các ... 𝐖𝐢𝐧 = 𝐆𝐓𝐍(𝐢𝟐 − 𝐢𝟏) Trang 11THERMODYNAMICS & HEAT TRANSFER – CHAPTER 1212.4 CHU TRÌNH MÁY LẠNH SỬ DỤNG KHÔNG KHÍ LÀM MÔI CHẤT LẠNH (SIMPLE GAS REFRIGERATION CYCLE) 11 Trang 1212.4 CHU TRÌNH

Ngày tải lên: 25/12/2024, 12:19

... inequality: T H >T HC>T LC >T L The heat-transfer surface areas (F1 and F2 ) of high- and low-temperature heat exchangers are finite The total heat transfer surface area (F) of the two heat ... heat-transfer surface area of the high- temperature-side heat exchanger , β is the overall heat transfer coefficient and F2 is the heat-transfer surface area of the low-temperature-side heat exchanger Defining ... heat transfer law, including generalized convective heat transfer law and generalized radiative heat transfer law, ( n m) Q∝ ∆ T , is derived by taking an ecological optimization criterion as the

Ngày tải lên: 05/09/2013, 15:28

... measurement was calculated according to Eq.(25) and was 3.7% 7 Convective heat transfer in circular minichannels On the basis of the mass transfer coefficient measurements and mass/heat transfer ... deteriorates heat transfer (Hemida et al., 2002) (c) pulsation does not affect heat transfer (Yu et al., 2004), and (d) heat transfer enhancement or deterioration may occur depending on the flow parameters ... 35th National Heat Transfer Conference, Anaheim, California, Paper 12134 Kandlikar S.G., Garimella S., Li D., Colin S., & King M.R (2006) Heat Transfer and Fluid Flow in Minichannels and Microchannels,

Ngày tải lên: 20/06/2014, 06:20

... to the overall heat transferthrough a wall, heat transfer with phase change and the fundamentally different “radiationbased heat transfer” will be discussed 2 The “quality” of heat transfer 2.1 ... Preliminary considerations What is commonly named heat transfer is a process by which energy is transferred across a certain system boundary in a particular way This special kind of energy transfer ... heat transfer coefficient h or its nondimensional counterpart, the Nußelt number Nu, not all information about the heat transfer process is available as will be demonstrated hereafter 3 Heat Transfer

Ngày tải lên: 20/06/2014, 06:20

... increase, the improved heat- transfer. .. improved heat- transfer regime is eventually replaced with that of deteriorated heat transfer 486 Heat Transfer - Theoretical Analysis, ... characterized with lower values of the wall heat transfer coefficient compared to those at the normal heat transfer; and hence has higher... Improved Heat Transfer NHT Normal Heat Transfer ... Heat Transfer NHT... heattransfer regimes as well as a peak (“hump”) in HTC near the pseudocritical point are clearly shown in this figure The deteriorated heat- transfer regime appears

Ngày tải lên: 20/06/2014, 06:20

... shell and tube exchangers such as baffles and tubes may be damaged or the gaskets and plates in plate heat exchangers may become faulty The damage may also aggravate the fouling problem by causing ... (7) Based on the inside heat transfer surface area Ai, the overall heat transfer coefficient is expressed as: In Eqn (18), it is assumed that the wall thermal resistance is for a flat plate wall ... transfer performance Trang 149 Performance data analysis As mentioned above, fouling has many effects on the heat exchanger perfornance It decreases the exchanger thermal capacity and increases the

Ngày tải lên: 20/06/2014, 06:20

... measurement is reliable to evaluate the heat transfer coefficient at least for a steady flow condition (Nakamura, 2007a and 2007b) Also, a dynamic response of this measurement was investigated ... – 70 mm) has a spot-like characteristic, as shown in the instantaneous distribution (Fig 20 (a) and 21 (a)) The high heat transfer spots appear and disappear almost randomly but have some periodicity ... section, the heat transfer behind a backward-facing step Trang 15which represents the separated and reattaching flow was explored by employing a performance thermograph Special attention was devoted

Ngày tải lên: 20/06/2014, 06:20

... Experimental and theoretical model Heat transfer study; (Al-Kassir et al., 2005) SCD (indirect heating) Experimental Heat and mass transfer study; Studied the performance of a lab-scale furnace-heated ... of a calciner and an impregnator, represented by a cylindrical vessel and a double cone vessel respectively Particle-particle heat transfer was modeled using standard heat balance equations and ... The most basic granular heat transfer model consists of three basic mechanisms (Ohmori et al., 1994): i Wall-to-surface heat transfer; ii Heat penetration in packed beds; iii Granular convection...

Ngày tải lên: 02/10/2015, 17:14

... Experimental and theoretical model Heat transfer study; (Al-Kassir et al., 2005) SCD (indirect heating) Experimental Heat and mass transfer study; Studied the performance of a lab-scale furnace-heated ... of a calciner and an impregnator, represented by a cylindrical vessel and a double cone vessel respectively Particle-particle heat transfer was modeled using standard heat balance equations and ... The most basic granular heat transfer model consists of three basic mechanisms (Ohmori et al., 1994): i Wall-to-surface heat transfer; ii Heat penetration in packed beds; iii Granular convection...

Ngày tải lên: 07/10/2015, 10:10

... Dimensionless Parameters 59 Table 4.2 Thermal Conductivities of Materials 69 Table 4.3 Heat Transfer Specifications and Areas 69 Table 5.1 A Comparison between Experimental Data & Simulated 77 Results Table ... several locations The recuperative heat exchangers have two separate flow passages and the streams continuously exchange heat with each other Such heat exchangers are relatively inexpensive to manufacture ... The advantages and disadvantages of the stored expendable cryogen are tabulated below: National University of Singapore Filename:TeoHY.pdf CHAPTER INTRODUCTION Table 1.2 Advantages & Disadvantages...

Ngày tải lên: 27/11/2015, 11:20

... article as: Sergis and Hardalupas: Anomalous heat transfer modes of nanofluids: a review based on statistical analysis Nanoscale Research Letters 2011 6:391 Submit your manuscript to a journal ... properties of nanomaterials and radiative heat transfer at the nanoscale Presentation at the 44th AIAA Aerospace Sciences Meeting and Exhibit, Georgia Institude of Technology, Atlanda, Georgia 2006 128 ... boiling of nanofluid on a short heated surface Int J Multiphase Flow 2010, 36:375-384 104 Sergis A, Hardalupas Y: Anomalous heat transfer modes of nanofluids: a statistical analysis approach review...

Ngày tải lên: 21/06/2014, 03:20

... conjugate heat analytically or numerically, and the heat conduction equation transforms to a transfer analysis Laplace equation for the transform parameter U(T ) The heat conduction equation ... reference manual, White Plains, New York Rahaim, C., Cavalleri, R.J and Kassab, A. J (1997), “Computational code for conjugate heat transfer problems an experimental validation effort”, AIAA Paper 97-2487 ... thermal analysis method with application to metallic thermal protection panels”, AIAA Journal of Thermophysics and Heat Transfer, Vol 11 No 2, pp 173-81 Li, H and Kassab, A. J (199 4a) , “Numerical...

Ngày tải lên: 16/06/2016, 01:11

... [1] Saini J.S Use of artificial roughness for Enhancing Performance of Solar air heater Proceedings of XVII National and VI ISHME/ASME Heat and Mass Transfer Conference, IGCAR, Kalpakkam India 2004; ... rectangular rib roughened passage” International Journal of Heat and mass transfer; 123: 675-681, 2001 [6] Lau S.C., McMillin R.D and Han J.C Turbulent Heat transfer and friction in a square channel ... Tariq, A. , Keshav Kant and Panigrahi, P K., Heat transfer enhancement using an internally threaded tube”, Proceeding of the 4th ISHMT-ASME and 15th National Conference on Heat and Mass transfer...

Ngày tải lên: 05/09/2013, 16:10

... material and method of approach is followed by chapters on chemical reactor analysis (Chapter 2), heat exchanger analysis (Chapter 3), and mass contactor analysis (Chapter 4) These chapters have ... the analysis Time constraints have a significant impact on this decision, as resources available We will illustrate this aspect of analysis by examining chemical reactors, heat exchangers, and mass ... presentation of heat and mass transfer, maintaining mathematical rigor while keeping mathematical analysis to a minimum This allows students to develop a strong conceptual understanding and teaches...

Ngày tải lên: 02/04/2014, 15:52

... Therefore, radiation brings heat to our planet Heat excites the black surface of the vanes more than it heats the white surface Black is a good absorber and a good radiator Think of black as a large ... doorway that allows heat to pass through easily In contrast, white is a poor absorber and a poor radiator of energy White is like a small doorway and will not allow heat to pass easily Note that heat ... formulation of Navier-Stokes equations for fluid 210 Heat Transfer Heat Transfer - Mathematical Modelling, Numerical Methods and Information Technology flow and heat transfer Simulations as well as...

Ngày tải lên: 20/06/2014, 01:20

... IX Heat Transfer in Micro Systems Chapter Integrated Approach for Heat Transfer in Fluidized Bed Reactors Zeeshan Nawaz, Shahid Naveed, Naveed Ramzan and Fei Wei Chapter Two-Phase Heat Transfer ... Quantitative Visualization of Heat Transfer in Oscillatory and Pulsatile Flows Cila Herman 353 Chapter 14 Application of Mass /Heat Transfer Analogy in the Investigation of Convective Heat Transfer ... Coefficient Measurement 307 Douglas Fernandes Barbin and Vivaldo Silveira Junior Chapter 12 Marangoni Condensation Heat Transfer Yoshio Utaka Part Chapter 13 327 Heat Transfer Phenomena and Its Assessment...

Ngày tải lên: 20/06/2014, 06:20