نتایج جستجو برای: frictional pressure drop

تعداد نتایج: 452114  

Journal: :نشریه دانشکده فنی 0
محمد علی اخوان بهابادی مسعود جمالی آشتیانی امیر محمد پور

the pressure drop of refrigerant r-134a flow boiling inside a horizontal tube has been investigated experimentally. the test set-up which was used in this investigation is a well instrumented vapor compression refrigeration system. these instruments are thermocouples, flow meter, pressure gauges and the pressure drop measuring apparatus. this system consisted of three electrically heated evapor...

2012
Sung-Min Kim Issam Mudawar

Previous models and correlations for the prediction of pressure drop in adiabatic and condensing mini/ micro-channel flows have been validated for only a few working fluids and relatively narrow ranges of relevant parameters. A universal predictive approach for these flows must be capable of tackling many fluids with drastically different thermophysical properties and very broad ranges of all g...

2012
Sung-Min Kim Issam Mudawar

This paper is a part of a recent series of studies by the authors to develop universal predictive tools for pressure drop and heat transfer coefficient for mini/micro-channel flows that are capable of tackling fluids with drastically different thermophysical properties and very broad ranges of all geometrical and flow parameters of practical interest. In this study, a new technique is proposed ...

Journal: :تحقیقات مهندسی کشاورزی 0
عبداله ایمان مهر دانشجوی سابق دکتری دانشگاه تربیت مدرس برات قبادیان دانشیار دانشگاه تربیت مدرس سعید مینایی دانشیار دانشگاه تربیت مدرس محمدهادی خوش تقاضا دانشیار دانشگاه تربیت مدرس

a canola seed pneumatic conveyor was designed and constructed to convey canola seed at a 90 g/hr mass flow rate through a 58 mm diameter pipe. physical and aerodynamic properties of the canola seed that are critical to the design process were measured. system pressure drop, comprising air pressure drop and solid pressure drop and which is the most important aspect of pneumatic conveyor design, ...

2005
M. Bahrami M. M. Yovanovich J. R. Culham

The characteristics of fully-developed, laminar, pressure-driven, incompressible flow in rough circular microchannels are studied. A novel analytical model is developed that predicts the increase in pressure drop due to wall roughness in microtubes. The wall roughness is assumed to posses a Gaussian isotropic distribution. The present model is compared with experimental data, collected by other...

KATAPAK-S is a type of structured catalytic packing, which is used in reactive distillation processes. The dry pressure drop characteristic (the pressure drop in the absence of liquid flow) is of significant importance for the investigation of process hydrodynamics. In this paper, the dry pressure drop within the catalyst packed channels of KATAPAK-S has been investigated using Computational Fl...

Amir Mohammadpour Hossein Shokouhmand Masoud Jamali Ashtiani Mohammad Ali Akhavan Behabadi

The pressure drop of refrigerant R-134a flow boiling inside a horizontal tube has been investigated experimentally. The test set-up which was used in this investigation is a well instrumented vapor compression refrigeration system. These instruments are thermocouples, flow meter, pressure gauges and the pressure drop measuring apparatus. This system consisted of three electrically heated evapor...

2006
B. R. Vijayarangan S. Jayanti A. R. Balakrishnan

Measurements of two-phase flow pressure drop have been made during a phase-change heat transfer process with refrigerant (R-134a) as a working fluid for a wide range of pressures right up to the critical pressure. The experiments were conducted in a uniformly heated vertical tube of 12.7 mm internal diameter and 3 m length over a heat flux range of 35–80 kW/m, mass flux range of 1200–2000 kg/m ...

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