The paper presents the results of analysis which enable determination of the value of the pressure losses coefficients which occurred during air suction and flow through a perforated pipe. Knowledge on them is indispensable for determination of regularity of air suction along the considered pipe. Exiting the basic energy equation, firstly a local coefficient of pressure losses was determined and then the form of the relation for its determination in the function of independent variables was found out. In the second stage, the value of pressure losses caused by mutual crossing of two streams (axial stream and stream sucked by the side surface of a pipe) was determined. Also, for this coefficient, the form of the correlation equation including power relation between the independent variables was emphasised. The calculated values of the discussed coefficients from determined forms of correlation equations are satisfactorily compliant with the calculated values from the experiments which were carried out.
If the inline PDF is not rendering correctly, you can download the PDF file here.
Dutta P. Dutta S. (1998). Effect of baffle size perforation and orientation on internal heat transfer enhancement. International Journal of Heat and Mass Transfer 41 3005-3013.
Greig D. Siddiqui K. Karava P. (2012). An experimental investigation of the flow structure over a corrugated waveform in a transpired air collector. International Journal of Heat and Fluid Flow 38 133-144.
Hwang J-J. (1995). Heat transfer in a rectangular channel with perforated turbulence promoters using holographic interferometry measurement. International Journal of Heat and Mass Transfer 38(17) 3197- 3207.
Ko K-H. Anand N.K. (2003). Use of porous baffles to enhance heat transfer in a rectangular channel. International Journal of Heat and Mass Transfer 46 4191-4199.
Karki K.C. Patankar S.V. (2006). Airflow distribution through perforated tiles in raised-floor data centers. Building and Environment. 41 734-744.
Kurpaska S. Latała H. (2010). Energy analysis of heat surplus storage systems in plastic tunnels. Renewable Energy 35(12) 2656-2665.
Ni J-Q. Kaelin D. Lopes I. Liu S. Diehl C.A. Zong C. (2016). Design and performance of a direct and continuous ventilation measurement system for variable-speed pit fans in a pig building. Bioosytems Engineering 147 151-161.
Liou T-M. Chen S-H. (1998). Turbulent heat and fluid flow in a passage disturbed by detached perforated ribs of different heights. Journal Heat and Mass Transfer 41(12) 1795-1806.
Mongkon S. Thepa S. Namprakai P. Pratinthong N. (2014). Cooling performance assessment of horizontal earth tube system and effect on planting in tropical greenhouse. Energy Conversion and Management 78 225-236.
Pełech A. (2009). Wentylacja i klimatyzacja - podstawy. Oficyna Wydawnicza Politechniki Wrocławskiej ISBN 978-83-7493-445-9.
Vorontsov L. Wachowicz E. (2008). Modelowanie przepływu powietrza w kanałach wentylacyjnych pieczarkarni. Inżynieria Rolnicza 10(108) 269-276.