Hiba Mudhafar Hashim ,Ihsan Y. Hussain ,



CFD,Forced Convection,Inclination and Vibration,Electronic Equipment Cooling,Heat Sink,


The present investigation adoptsComputationalFluid Dynamics CFD to analyze the problem of forced convection cooling of electronic equipment equipped with a heat sink, including inclination and vibration effects. Two fans were usedto circulate the air inside the computer chassis. Three main components on the motherboard were used;CentralProcessorUnit (CPU), North Bridge, and South Bridge.These components generate heat at the rate of 3750, 2500, and 2222.22kW/ respectively. Three different types of heat sink were used for CPU, these are: plate heat sink, radial heat sink without core,and radial heat sink with core.Theother two main components on the motherboardused the same standard heat sink. The two fans are operated with different cases to specify the suitable operation. Inclination for the computer chassis and motherboard with vibration influence was also investigated. The power dissipation, fan flow rate, and ambient temperature are fixed. The results show that the radial heat sink with core enhances the heat transfer by reducing the temperature of the CPU. Also the influence of vibration has more effect in case of without heat sink, for other cases the influence of vibration is not affected in the investigated range. The effect of inclination angle for computer chassis also is not affected, just when the mother board inclination by  from top edge with vertical plane, the temperature reduction approximately 18  in case without heat sink,  4.8 with plate heat sink on CPU, 1  in case with radial heat sink. The CFD analysis was validated with a thermal profile for real operation CPU, the results show good agreement with a mean deviation of (0.023). A radial heat sink with core reduce the temperature more than 114.5 compared without heat sink on CPU case.


I. ANSYS FLUENT, version 14.5, ANSYS Inc. 2013, “fluent 14.5 users guide”, 2013.

II. C.B.Baxi, and A.RamachAndran, “effect of vibration on heat transfer from spheres”, journal of heat transfer, 2016.

III. Cengel Y.A. Heat transfer a practical approach (MGH, 2002)

IV. EmreOzturk, ”CFD analysis of heat sinks for CPU cooling with fluent”, thesis submitted to the graduate school of natural and applied sciences, Middle East technical university, 2004.

V. Farouq Ali S. GDHAIDH, “heat transfer characteristics of natural convection within an enclosure using liquid cooling system”, submitted for the degree of doctor of philosophy, 2015.

VI. Fluent user services center, accessed on septemper,2019.

VII. GeorgiosBalafas, “polyhedral mesh generation for CFD-analysis of complex structures”, master thesis for the master of science program computational mechanics,2014.

VIII. HibaMudhafarHashim , Ihsan Y. Hussain, ” Natural Convection Cooling of PCB Equipped with Perforated Fins Heat Sink including Inclination and Vibration Effects”,JMCMS,2019.

IX. Intel Celeron, D processor in the 775-Land LGA package for embedded applications data sheets.

X. J. M. Jalil, E.H.Ali and H.H.Kurdi, “numerical and experimental study of CPU cooling with finned heat sink and different P.C.Air passages configurations”, Al-Nahrain journal for engineering sciences, vol.21, No.1, pp.99-107, 2018.

XI. J.S Chiang, S.H.Chuang, Y.K.Wu, H.J Lee, “numerical simulation of heat transfer in desktop computer with heat generating components”, international communication in heat and mass transfer 32 (2005) 184-191.

XII. Jalal M. Jalil, Ekbal H. Ali and Hiba H. kurdi, “numerical and experimental study of cooling in desktop computer with block heat sink”, engineering and technology journal, vol.36, part A, No.4, PP.430-438, 2018.

XIII. K. Sreenivasan and A.Ramachandran, “effect of vibration on heat transfer from a horizontal cylinder to a normal air stream”, int.J.Heat mass transfer, Vol.3, pp.60-67, pergamon press, 1961.

XIV. MarcinSosnowski, JaroslawKrzywanski, Karolina G rabowska and RenataGnatowska, “polyhedral meshing in numerical analysis of conjugate heat transfer”, EPJ web of conferences 180, 02096 (2018).

XV. N.D etal,”heat induced vibration of a rectangular plate” journal of engineering for industry, 1974.

XVI. P.K.Nag and A.Bhattacharya, “effect of vibration on natural convection heat transfer from vertical fin arrays”, letters in heat and mass transfer, vol.9, pp.487-498, 1982.

XVII. Robert Lemlich, “effect of vibration on natural convective heat transfer”, industrial and engineering chemistry, 1955.

XVIII. S. Kong Wang, Juin Haw Hu and Chun-HsienKuo, “passive enhancement of heat dissipation of desktop computer chassis”, engineering applications of computational fluid mechanics, vol.4, No.1, pp.139-149, 2010.

XIX. SelinArodag, UtkuOlgun, FatihAkturk and BurcuBasibuyuk,”CFD analysis of cooling of electronic equipment as an undergraduate design project”,2009

XX. Wu- Shung Fu, and Bao-Hong Tong, “numerical investigation of heat transfer from a heated oscillating cylinder in cross flow”, international journal of heat and mass transfer, 45(2002) 3033-3043.

XXI. Wu-Shung Fu, and Chien-Ping Huang, “effects of a vibrational heat surface on natural convection in a vertical channel flow”, international journal of heat and mass transfer 49(2006) 1340-1349.

View Download