See my publications on measuring the thermal conductivity of refrigerants and their mixtures with transient hot wire..

hi vipin

below link is help to for various techniques for thermal conductivity mesurement. 

http://www.evitherm.org/default.asp?ID=308

Actually i have clearly mentioned in my question that i want thermal conductivity measurement specifically for liquids..!!

Thanks anyways!!

Hi Vipir,

i suggest you KD 2 Pro thermal analyser.  It is a portable device that operates based on transient line heat source.

KD 2 Pro is  reliable tool for thermal conductivity measurements in liquids over wide range of temperatures.

In fact, accuracy and portability contributed to its popularity among researchers.  

DTA can be used

Try this source. Handbook of Thermal Conductivity of Liquids and Gases. By Natan B. Vargaftik

Measuring thermal conductivity of liquid is really difficult from practical point of view.

By the way what kind of liquid. For liquid with high viscosity like glycerol KD 2 is a way to go, but for Liquid like water with low viscosity KD 2 is not a solution in my view even a lot of paper published with using that device.

I recommend built your own device based on transient method.

The flash method is used for measuring thermal diffusivity liquids.

Transient hot wire (THW)

Transient plane source

steady-state method by using a coaxial-cylinder cell

Hot wire technique is the most accepted and used method. For low liquids amounts you can use photopyroelectric method. This is a photothermal technique suitable for thermal diffusivity, D, and thermal effusivity, e, measurement. Thermal conductivity can be calculated as k=eD^1/2

I use steady-state method with a coaxial-cylinder cell with deviations lower than 1 %. You can download some literature in my profile. What kind of liquids do you want to measure?

As somebody is interested in: We start a Ring Robin Test with an oil, a coolant, a PCM and a low pressure refrigerant in Germany with help of the Society of Thermal Analysis (GEFTA) currently.

For liquids, if you require low uncertainty, there is only one method the THW (Assael M.J., Nieto de Castro C.A., Roder H.M., and Wakeham W.A., Chapter 7, "Transient Methods for Thermal Conductivity", in "Experimental Thermodynamics. Vol. III. Measurement of the Transport Properties of Fluids", Eds. Nagashima A., Sengers G.V., and Wakeham W.A., Blackwell Scientific  Publications, p.161 - 195 (1991).  ISBN: 0-632-029978 ). This is known since 1991. Do not reinvent the wheel. THW will give you an absolute uncertainty of +/-0.5%. I have been invloved with THW for 35  years now. Just make sure you employ the technique properly. I strongly advise you to avoid any unexpensive commercial instruments unless 10% is good for you. If you read Tertsinidou et al (2015) Int. J. Thermophys. you will see the effect of bad application of THW and also of commercial needle probe insstruments. In conclusion, if you are going to do it, do it RIGHT, no simplifications...

Thank You Dr. Steffen.

I would like to measure thermal conductivity of various refrigerants such as R134a and R410A and i would also like to measure the thermal conductivity of refrigerant oil mixture.

See my publications on measuring the thermal conductivity of refrigerants and their mixtures with transient hot wire..

Thank you prof. Marc for this befitting reply.

So according to you, THW is the most appropriate method to be used for measuring thermal conductivity of liquids. I will have a look at the references mentioned by you.

Thank you very much.

Dear Vipin,

Prof. Marc J. Assael made the measurements for the refriegrants very exactly. You can trust his measurements. We both (Marc in Thessaloniki, Greece and I in Dresden, Germany) can execute this measurements with the same accuracy. I think it depends on price and time.

I think and I believe Marc has the same opinion: If you never have done a thermal conductivity measurement of liquids before, than don't think a minute about constructing a measurement equipment by yourself. It is connected by many many problems that you never thought about before and the price of the equipment is much higher than service measurements will be.

Kind regards and please contact Marc and me for service measurements.

Thank you Dr. Steffen ...Currently i am going through the research papers published by you and Prof. Marc.

Thank you very much.

There is a paper entitled: "Techniques for measuring the thermal conductivity of nanofluids: A review" which is very helpful. The link is as below:

http://www.sciencedirect.com/science/article/pii/S1364032110000729

Thank You Dr. Ehsan..!!

Thermal conductivity of the liquid can be measured using KD2 pro thermal property analyzer (Decagon, Canada). The probe sensor used for these measurements are of 6 cm in length and 1.3 mm in diameter

Thermal conductivity of the liquid can be measured using KD2 pro thermal property analyzer (Decagon, Canada). The probe sensor used for these measurements are of 6 cm in length and 1.3 mm in diameter

Thermal conductivity of the liquid can be measured using KD2 pro thermal property analyzer (Decagon, Canada). The probe sensor used for these measurements are of 6 cm in length and 1.3 mm in diameter

Dear Mr. Nair, KD2 Pro can be use to measure the thermal conductivity of liquid samples. However, for low viscosity liquids like water utmost caution is needed during measurements to avoid inaccuracies due to natural convection. I also suggest you consult Prof. Asseal to help you as Dr. Feja recommended. All the best for your research

What is the price of the equipment in India

Publications based on needle sensors are usually not accepted as serious scientific work, as the instrument is not backed by a full rigorous theory.

Dear Vipin,

There are mainly two methods to determine the thermal conductivity of the materials. Such as steady state method, transient method and Laser flash methods. Under steady state method, transient method technique is most commonly used to determine the thermal conductivity of the low conductivity materials. General objective of conductivity laboratory experiment is to apply the concepts of heat flow to measure the thermal conductivity of various materials. Temperature is a measure of the kinetic energy of the random motion of molecules with a material.

1. Steady state methods(Searle's bar method, Lees' disc method)

2. Transient methods (Transient Hot Wire Method, Transient plane source method, Modified transient plane source (MTPS) method) laser flash methods, omega methods, Freestanding sensor-based 3ω-method, time-domain thermoreflectance method, DynTIM method

Laser flash methods, Transient Hot Wire and photon-correlation spectroscopy is quite common.

Measuring devices: thermal conductivity meters, Gemology, KD2 pro thermal analyzer etc.

Hope it help you out.

Ashish