The significance of thermal contact resistance between bearing ball and raceway is investigated and their applications in the analysis of heat flow through the composite layers are discussed. In the present work, the surface roughness, interface temperature & medium are varied in order to estimate the effective thermal contact resistance of the models under steady state condition. The surface roughness and the interface temperature are considered in the range 3.14 - 6.76μm and upto 900C respectively. The temperature drop profile is plotted on bearing model to study the temperature distribution using solidworks-11

This paper investigates the impact of strain sensitivity on the linear model mock-up bearing (LMMB) using digital image correlation (DIC) technique. This work addresses the lack of norms, standards, reference of elastic/plastic deformation of bearings elements. Towards that, experimental set-up was designed and fabricated with a set of LMMB (AISI4140) with commercially purchased steel balls (AISI52100) to study the raceway relative approach and localized strain rate on steel ball, wherein raceway relative approach is measured using LVDT & screw gauge and results are compared with DIC results. These data are very much useful in design and development of large diameter slewing bearing for fast breeder reactor and also these results can be used to optimize the number of ball, load, and tolerance on bearing.

The challenge in design and manufacturing tasks includes precise measurement of static friction, stiffness, deformation, raceway relative approach, and heat distribution of slewing ring bearings. These parameters affect the life and performance of the rolling elements bearing at elevated thermal environments. Toward that, sections of a complete bearing called linear model mock-up bearing (LMMB) have been designed and fabricated for the study of heat distribution. The physical significance of the heat distribution on bearing elements was studied using square-guarded hot-plate (SGHP) apparatus. The thermal contact conductance (TCC) experiments were carried out by varying surface roughnesses and interface temperatures under different loading conditions by using the combinations of steel plates and LMMB under dry and lubricated conditions. From this study, it is observed that the TCC values obtained from LMMB were significantly high across the contact surfaces of AISI 42100–AISI 52100–AISI 4140 steel plate's combination. Further, the finite element method (FEM) simulation has been carried out successfully to evaluate the temperature distribution in combination of bearing steel plates and LMMB by solidworks software, and the results are discussed.

The research work done is related to solar thermal energy storage using Saw tooth shaped absorber along with Phase Change Material (PCM) with integrated collector-saw tooth solar water heating (ICSTSWH) system. Towards that Design and fabricated ICSTSWH. Solar heat gain has been enhanced by means of saw tooth shape roof which have maximum transmissivity to collect the solar irradiation. Top layer is made up of a double layer glass glazing where heat transfer analysis is done for different mediums like hydrogen, oxygen and vacuum gas. Storage tank is completely insulated except saw tooth portion. The bottom portion of the glass is coated with black color for making the absorbance co-efficient close to one. 20 aluminum pipes of 1mm thick are fixed in parallel and filled with Paraffin wax [C₁₂] which stores the thermal energy in the form of latent heat. The PCM material gets charged when there is available of solar radiation and discharges whenever the source is not there. The trapezoidal shape solar thermal energy storage system provides energy saving which depends predominately on the amount of thermal stratification within the saw tooth storage cavity. This design brings on thermal stratification in the water storage, and provides enough energy storage to meet the hot water requirements between 6 am to 8 am (early morning) in institution's hostels.