• Ajaykumar B. Bhosale
• B. K. Sonage

Concept and purpose of this paper was to develop a method to measure thermal conductivity of liquids and explain theoretical basis. In this method uses modified parallel plate thermal conductivity apparatus and compare the measured thermal conductivity of engine oil and radiator coolant from apparatus to the reference value of these liquid from data book. Most of the researchers have been try to find the best method to improve heat transfer rate, increase the thermal conductivity of the liquids. Heat transfer plays a main role in most of the fields like power generating plants, transportation, microelectronics and air conditioning because the heating and cooling processes involved. To increase the efficiency, in the above field’s uses heat transfer devices, of such an improvement, it becomes possible to reduce the size of the devices. Other major parameters in heat transfer are the thermal conductivity of the working liquid used in the system. Applications of the liquids in the thermal systems have been well documented in the researcher and industrial groups. Modified Parallel Plate Thermal Conductivity (MPPTC) apparatus is developed to measure the thermal conductivity of liquids. This apparatus consists of heater assembly above the test liquid specimen and a chiller assembly below the test liquid specimen. This apparatus creates a difference in temperature which is measured by calibrated thermocouples which is placed in the parallel plates. This temperature difference can be used, with the heating power, to calculate the thermal conductivity of the test liquid specimen. This concept, with a sufficiently minimum thickness of test liquid layer, prohibits convection effect in the test liquid specimen and creates a heat transfer mechanism because of conduction mode. This apparatus is fully insulated for restricting nearly all heat conduction to the all direction. This MPPTC apparatus has been calibrated to ensure accurate and precise measurement results. All thermocouples are calibrated and incidental heat loss has been calculated to minimize errors occurring in liquid thermal conductivity measurements due to heat loss through the apparatus. Distilled water has been used in MPPTC apparatus to calculate incidental heat loss. Engine oil and radiator coolants have been used in MPPTC apparatus to measure thermal conductivity which produces accuracy of approximately 95 % confidence. Keywords—Modified Parallel plate method, engine oil,radiator coolant, thermal conductivity, experimental procedure, calibration.

"Assessment of Thermal Conductivity of Liquids by Modified Parallel Plate Method", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.574-579, June-2019, Available :http://www.jetir.org/papers/JETIR1906C95.pdf

"Assessment of Thermal Conductivity of Liquids by Modified Parallel Plate Method", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp574-579, June-2019, Available at : http://www.jetir.org/papers/JETIR1906C95.pdf