Questions related to Thermal Properties
I'm working on project where I need the thermal property of fertilizer but I have know Idea how to calculate it. Could anyone suggest the formula to calculate the thermal conductivity of solid mixture?
Using the Boltztrap and Quantum espresso I was able to calculate the electronic part of thermal conductivity but still struglling for the phononic part of thermal conductivity.
I tried the SHENGBTE but that demands a good computational facility and right now I am not having such type of workstation. Kindly suggest some other tool that can be useful for me in this regard.
Dr Abhinav Nag
In many cases, e.g. the thermal hydraulics of thermal waters, or the HDR or the one tube heat extraction, the estimation of the rock/water heat exchange is of central importance. It now turns out, that not infrequently the thermal properties of water and rock are so different that the the properties of the water can be neglected. This leads to a drastic simplification of the rock/water heat exchange. This is shown by an example, the heat loss of the thermal water in the discharge section.
It is strange that apparently no one has seen this so far.
Can anyone provide ASTM E1007-90? For measuring concrete thermal property ASTM E1007 or ISO 10534-2-90 can be used?
We assume that the answer is yes and that it would be of great importance in the theory of heat conduction and in experimental measurements of the thermal properties of different materials.
I'm researching on the comparative analysis of the different waste-based innovations in the Philippines but the existing materials do not have information on its thermal properties. Is there any testing center in the Philippines that specializes in testing for thermal properties or maybe thermal comfort?
The study revolves around finding the mechanical as well as thermal properties of a bamboo species commonly found in North Eastern states of India. For example, on the preliminary studies conducted, there have been no such properties found for thermal coefficient of expansion, as well as the properties of the particular species to conduct analysis for FEM analysis on a Bamboo Cross-Section.
It would be of great help if someone could help me find these properties for my final year thesis.
Wishing a huge thanks to everyone in advance.
I'm working for graduation thesis, and want to simulate the heat generation process of 18650 battery, and i need to have some parameters from experiment like Resistance vs SOC, entropy change vs SOC, ... I searched the data sheet from manufacturer, but it's not enough.
Any body know about it? Please give me. Thank you so muchhh.
I have performed some thermal transport calculation of multi-component alloys using MD simulation. Now, I am trying to see the effect of chemical short-range order on these thermal properties. I have read some related papers, but they are not describing this method elaborately. If anybody can provide me some directions regarding this short-range order in MD simulations, it would be a great help.
I am studying and researching on a nano sheet using quantum espresso computing software. But how to do PDOS, phonon,thermal properties calculations I do not know, with this software and I do not have anyone to teach me, please help me if you have information including: booklet, PDF, command ....thank you
I have a pipe that carries a fluid. The pipe is drawing heat from a source and is transferring to the fluid which is being circulated. I need to know the exit temperature of the fluid.
Known variables are:
1. Inlet temperature of the fluid
2. Inlet pressure of the fluid
3. Outlet pressure of the fluid
4. Constant mass flow rate
5. Thermal properties of the pipe
6. Temperature of the pipe
Exit temperature of the fluid
How to proceed with this question?
Machine learning, for example Artificial Neuron Network method has benn widely used in predicting various properties of oxide glasses in recent years, including mechanical, chemical and thermal properties, etc. but it is rarely used for non-oxide glasses (e.g., fluoride, fluorophosphate, chalcogenide).
What is the reason, because few data can be obtained for non-oxide glasses as compared with the oxide ones?
I am looking for the viscosity of paraffin waxes like C18 ,C22 and etc. I have been searching for the viscosity or temperature dependent viscosity of different paraffin waxes for a week and yet can not find it. Is there any reference that you can suggest, which include thermal properties of paraffin waxes such as C18, C22, OM47 and etc.?
I need to know the best proportions of graphene oxide to add in the cement mixture and does it affect the thermal properties?
I am using indocyanine green in my simulation research project. from google and disparate papers i got some optical property of ICG nevertheless i didn't found any thermal property! it would be so much obliging if someone render thermal and optical property of ICG for different wavelength of light !
I'm working on a mono-layer compound I'm focused on electron phonon calculations and i want to calculate thermal properties such us thermal conductivity and electron phonon factor G i want to know how i can proceed
I am trying to simulate solar cell using Lumerical DEVICE smulation software. I need to add material data for electrical and thermal properties. Where to find those?
I require data for PCBM, PEDOT:PSS.
How to calculate thermal conductivities of composites using 3DFEA based RVE analysis, can anyone suggest the procedure? in Abaqus CAE
Hi I am working recently on a project where I have to study how the thermal properties or heat transfer enhancement of nanofluids as the volume fraction changes, or if a magnetic field is applied to a ferrofluid how does that affect the heat transfer. Is there a way I could model any of this in ANSYS. Im not sure but I was looking through ANSYS APDL to investigate this effects, is there a better way to model them.
I need thermophysical and electrical oil properties to investigation of DC discharge in oil.
Are multicomponent mixture models effective and precise in such calculations? If yes, what MC-modells can You suggest?
Can somebody advice something?
Thank you a lot in advance!
I want to study the thermal properties of the composite (MWCNT+silver nanoparticles), so what method of synthesis do i use so that the composite sustains itself under elevated temperatures.
I am conducting physical experiments that involve heat exchange between the water being pumped inside a galvanized iron pipe and the pipe's surrounding heated temperature. I would later be simulating the physical experiments using a software (Fluent) as well and then comparing the numerical and experimental results. So, the thermal properties of the galvanized iron pipe I enter to the software should closely match the real properties of the pipe in order for the comparison to be successful.
I searched a lot of books but the thermal properties were either available for steel or galvanized steel. But I could not find any thermal properties for "galvanized iron" or even normal "cast/wrought iron". Hence, could anybody kindly suggest a resource where I may be able to find the thermal properties (thermal conductivity, specific heat capacity) of iron pipes - if possible "galvanized iron" specifically?
Your advice would be much appreciated.
I'm currently working on a project that involves the simulation of CHT (Conjugated Heat Transfer) problems potentially leading to the evaporation of a water/glycol mixture.
Thus I would need to have the thermal properties (especially the coefficient of volume expansion) of both ethylene glycol (1,2-ethanediol) and propylene glycol (1,2-propanediol) in liquid and gaseous phases.
So far I've managed to find (relatively easily) the properties of the liquid components, but nothing regarding the gaseous components.
Could someone points me in the right direction for such data ?
how can be defined S-CO2 thermal properties in EES?
it means that supercritical CO2 has changed thermal properties.
are the properties the same as CO2 in EES software?
please give me a hand.
I am looking for a formula to calculate specific temperature drop in duct based on airflow, knowing the specific power loss, airflow, thermal properties of the duct, and air temperatures. The goal is to be able to produce the graph attached.
I do not know how to determine if plasma treatment of lignocellulosic fibers provokes superficial crosslinking and increases hydrogen bonding between cellulose chains. I have only found unverified explanations and information to hypothesise. In this sense, does anyone know if experimental or modelling evaluation techniques are available?
In advance, thanks a lot for your answers to this question.
Here, some related references:
Can somebody please put some light on how the position of band inversion, near or away the Fermi level affects the electrical transport and thermal properties in semi-metals?
Thanks in advance!
In order to model the crater formation (considering Inconel 825 as workpiece material) in EDM process, thermal properties such as Boiling temperature, Latent heat of melting and
Latent heat of vaporization are required. Where can I find the the values of the above mentioned properties.
Actually, I need free software for calculating thermal properties of crystalline solids namely, lattice thermal conductivity, and minimum thermal conductivity.
Hello to all :
This question is originated from the idea that every material (except for Superconductors) has a Seebeck Coefficient (S) different than zero, and from the idea that in every case when different metals or semiconductor materials are joined together, a Seebeck Effect at any scale is observed on the pair of materials.
So my question is:
When we measure the S of a given material, we place the sample between two plates at different temperatures, so we can stablish a Temperature Gradient and an unidirectional Heat Flux across the material. Then, we vary the Thermal Power imput, so we can vary the Temperature Gradient and obtain a set of Output Seebeck Voltages.
Then, we measure this Output Voltage and we plot a Graph of Delta(T) vs. Delta(V) as a linear x vs. y Graph. Finally we state that the slope of this Graph (positive for the N-Type materials and negative for P-Type) (because what we are measuring in our apparatus is the net Gradient (DeltaV/DeltaT), the formula in the Seebeck Coefficient has and additional (-) sign which turns S to a negative for N-Type semiconductors and positive por P-Type) is the Seebeck Coeff. for the material.
This measurement is always considered as if it was the absolute S coefficient of the material. But, What about the junction between the probe electrodes and our sample ? Since there is a Seebeck Voltage being generated at the junction too. Hence, our lecture from the voltmeter should be the Seebeck Coefficient of the junction: Se,s = Se - Ss
Se,s : is the Seebeck Coefficient of the junction between the sample and the electrode.
Se : is the Seebeck Coefficient of the Electrode.
Ss : is the Seebeck Coefficient of the Sample.
What do you think ?
Is this error virtually zero in practice, as much as we can ignore the effect of the Seebeck Effect of the junction electrodes/sample ?
How can we understand the fact that when we use these methods, we never talk about the contribution of he probe electrodes into the measured S Coefficient ?
Kind Regards !
Dear colleagues, hope you 'r having a good day :
I may get somehow involved in a project about Sb2S3 for possible thermoelectric uses, behold the motivation behind my question.
I already searched for this in the literature, but the only I could find for was the electrical and thermal properties for Sb2S3 thin films. However I have bulk materials .
Does anyone have a good reference for the measured (or values) Electrical Conductivity, Seebeck Coefficient & Thermal Conductivity for bulk-Sb2S3, regardless of the fabrication method ? The material I have is a Sb2S3 compacted pellet.
Thank you for helping !
Regards ! :)
Dear all :
May anyone share with me a Graph showing the curves for Temperature vs Thermal Conductivity, and Temperature vs. Electrical Conductivity/Seebeck Coefficient (in the same Graph) for distinct type of materials: (semiconductors, semiconductor alloys, metals, semimetals, etc.) showing the points in the range up to 1000°C ?
This is for use in Thermoelectric materials.
If someone can send it to me I'll appreciate it a lot
I am presently working on a project that mandates the modelling of temperature distribution across unclothed and clothed human skin tissue. The modelling should take into account the environment properties like temperature, humidity, wind velocity and biological parameters of the human body like blood perfusion rate, metabolic heat generation rate, thermal properties of various skin tissues etc..The geometry is similar to a co-axial cylinder assembly with each annulus representing a different tissue, such as , skin, muscle, bone, and blood. Kindly suggest a stepwise procedure for solving the problem using ANSYS FLUENT. The geometry is attached herewith for your perusal. I am using Penne's Bioheat model. I have, however, not been able to include human tissue and its properties such as perfusion rate and metabolic heat generation rate in the material section. Kindly help.
I am trying to model a composite made of both unidirectional and bidirectional prepregs. Is there a standard way to go about it? Furthermore how can one evaluate the thermal properties of a laminate made of BD prepregs?
I am a current MS Physics student where I work in a research lab studying condensed matter. Specifically, I use DFT based models (VASP, Quant. Espresso, Wien2k) and other software (ShengBTE, phonopy, thirdorder.py) to make calculations of electrical, magnetic, and thermal properties of materials.
I am curious to know how skills and experience with these programs translate in the professional world and career opportunities. I was unsure whether to post this as a question but I figured a discussion was more appropriate. I hope to get some insight from users of this site that can provide input on this topic. All responses are appreciated and encouraged.
I am looking for the thermal degradation pathway and products of 6-mercaptopurine (Temp.: 200-1000 Celsius, Inert atmosphere).
Any relevant reading suggestions are also much appreciated. Thanks.
I am working on a heat transfer model for hollow alumina spheres for high temperature aplications, but I have had a difficult time finding the thermal properties of alumina (Al2O3, 94-95% purity). In particular its thermal conductivity for a wide range of temperatures (300 K up to 2,000 K). It would be of great help if you could point me out to technical handbooks or specific research papers with empirical or even theoretical information for this property.
Thanks in advance for your support.
I am looking for an instrument(s) to measure thermophysical properties, specifically the latent heat of melting, thermal conductivity, and heat capacity of a PCM (phase change material).
I need to characterize several metamaterials, specifically the thermal properties, I was wondering if there's a experimental technique focused in the measurement of the apparent thermal resistance of not heterogeneous materials with complex geometries such as the ones attached in this question.
QUESTION 1): According to the reference articles, hot disk method to low-density insulating materials is considered to be questionable, due to the low thermal conductivity and low thermal inertia of these materials when compared to the thermal properties of the probe.
Coquard, R., Coment, E., Flasquin, G., & Baillis, D. (2013). Analysis of the hot-disk technique applied to low-density insulating materials. International Journal of Thermal Sciences, 65, 242-253.
when the method is applied to materials with thermal inertia strongly different from the probe (≈2 order of magnitude lower or more), the accuracy of the method becomes questionable. This is notably the case for common insulators used in the building industry like polymer foam or mineral wools. The preceding conclusions have been validated by experimental measurements on a standard low-density XPS foam sample and a superinsulating silica areogel. This is particularly the case for low-density XPS foams whose thermal inertia (r.C) is almost 2 order of magnitude lower than (rNi.CNi) and (rKa.CKa). In this case, the relative errors on k and (r.C) can exceed 10%. Lower errors are found for insulating materials with larger thermal inertia such as silica aerogel.
I have a few factors like temperature, humidity, radiation and thermal characteristics that affect thermal comfort inside a building. Now, I need the thermal simulation for a model in Ansys.
For my undergrad thesis, I need to know CTE (Coefficient of Thermal Expansion), Poisson ratio, yield stress, Young's modulus of AZ91 magnesium alloy .
I'm working on a research where we use laser induced forward transfer to place a nanowire on an interdigitated micro-electrode. The nanowire is originally suspended on ethylene glycol and part of the EG evaporates as part of the process. To make an accurate simulation of this process I need the thermal properties of ethylene glycol. Thanks!
Is there a technique by which one can characterize a structural and thermal properties of material at low pressure?
In tribology of polymer cases we know that:
In contrast to other materials, the tribological properties of polymers depend on the tensile strength and the toughness rather than on the hardness. Due to their thermal properties, polymers are very sensitive to frictional heating. Please suggests in case of friction stir welding of polymer, property mainly depend on tensile strength or toughness or hardness?
Your opinion is highly appreciated
We are adding RE elements in SnAgCu solder alloy to improve its thermal properties. Even through there isnt any large impact in decreasing of melting temperature then how to ananlyses the SAC alloy with these DSC graphs that its properties are improved. and what if graph contains more than one (or how closely or how large in amplitude) endothermic/exothermic peak.
thanks in advance
I need the following values (literature references) for ITO :
1) Thermal conductivity
2) Thermal Expansion
3) Specific Heat
**Preferably as a thin film.
Actually i am performing some thermodynamic analysis for my system and i dopnot have the Novec649 refrigerant in my Refprop. I need the excel file in which Temperature (from -20 till critical point), Sg and Sf values are enlisted so that i can draw the Ts diagram for this refrigerant ..If somebody can help me with this...
Hello all :
I would like to start a discussion about this topic.
I have just got myself interested on the topic of thermal transistors and started to search some readings about the subject, but it has n't come clear for me yet.
Does anyone can give a rough description of the working mechanisms of a thermal transistors ?
Is there a straightforward analogy between an Electric Transistors and a Thermal one ?
Are Thermal transistors and Heat transistors the same thing ?
Are there more than one kind of thermal transistor?
How can we associate the imput DeltaT or imput Heat Flux to the response of a Thermal Transistor.
I hope someone can give base ideas upon we can build a disscution on
Regards ! :)
Assume a design space of N physical variables (e.g. flow rate, particle size, thermal properties, etc.) that can be reduced to M < N dimensionless variables by applying dimensional analysis.
The region of the N-dimensional hyperspace which is experimentally accessible is assumed to be known. The set of dimensionless variables Qi defines M families of curves in sub-parts of the space, e.g. if Q1 = x1*y1 then y1 = Q1/x1 where x1, y1 are physical variables and Q1 a dimensionless variable that becomes as a parameter in this family of curves.
The question is now how to find "extreme conditions" (points) along the edges of the permissible physical (hyper)region that maximize the differences in values of the dimensionless variables?
For the simplest case of N = 2 and M = 1, this could be done graphically by taking intersections of the family of curves obtained by varying Q1 with the 2-dimensional region (e.g. rectangle) given by the physically accessible variable space.
For N = 3 this already seems more challenging and for N > 3 no direct visualisation seems possible.
Can anyone point me towards suitable algorithms or texts addressing this problem? The end goal is an experimental design in Q space yielding e.g. a regression function for a dimensionless target variable.
During my work on mechanical and thermal properties of solids particularly for elementary and compound Semiconductors I found a Sharing point between solid-solid phase transition and the melting point of these materials. In fact any phase transition acts as a melting point temperature value in my calculations in equations to determine mechanical or thermal properties such as thermal expansion and crystalline structure of those solids. The phenomenon works also on nanoscale solids, please make use the following articles.
It is of my interest to open a discussion for further understanding in this regard
What I see is these are two of the severals ways to go about a hybrid composite, but I am curious about the difference which these processes would bring about in the composite hybrid just because of the difference in processes.
We want to use calcium carbonate filled/reinforced homo polymer polypropylene for heat application - 290 Deg F for cycle duration of at least one hour or higher. Parts would be statically loaded and we would like no flat spot / heat deflection. Is there any other additive which may improve the thermal performance , if not by itself ( 40% Calcium carbonate and PP).
I feel that addition of any metallic powder (like metallic iron powder) should change the TGA and the DSC curves of calcite. However, I am not able to pin down the references.
Are there some references anyone can help me to identify, which gives the effect of an additive with different thermal properties on the TGA and the DSC curves?
I would like to compute what temperature my pressed organic powder-based pellet reached after the application of a high voltage (max voltage around 250 V, experiment carried on at room temperature). I though to use joule effect formula and to equate it to the usual Q=m*C*(T-T0). This is however an abrupt method...do you ever know a more reliable one? My material is a natural polymer which exhibit both ionic and electronic conduction. It can be considered as a conducting polymer (low conducting anyway).
Finally, could anyone of you indicate me where I can find a complete table chart showing the thermal properties of solid conducting polymers (particularly the specific heat) ?
Thank you very much.
Want to predict properties of alloy before actually developing it. Is there any simulator, analytical or numerical method available for the purpose?
I have seen many kinds of literature in which researchers talk about thermal properties enhancement of a nanofluid by inserting metal nanoparticle to the base fluid and gave reasons like the enhancement is due to nanolayer formation, due to aggregation of nanoparticles, due to enhanced Brownian motion of the base fluid molecules via MSD etc.
I have two basic questions:
1) Why can't we simply attribute this enhancement to the metal particle only as it has higher conductivity than the base fluid, i.e. due to metal particle we have this enhancement?
2) In metals most of the heat carriers are electrons and molecular dynamics do not calculate electronic contribution in determining thermal conductivity but do rather calculate lattice vibration contribution (phonon contribution) to it which is less than electronic contribution?
Then why researchers have found out the properties with metal nanofluid and rest of them have cited those papers too?
I am really grateful if I could get the answers. Thank you in advance.
I am working on a deep brain stimulation project and wanted to measure temperature rise in the brain when electrodes are inserted. I am looking for a commercially available phantom that has the same thermal properties as the brain for accurate temperature rise measurements.
Please let me know if you know of any such phantom gels.
We are trying to evaluate the thermal properties of gelatin. Few methods were followed and modified based on literature and understanding. However, based from previous experience of hydrophobic polymer, we thought of identifying the crystallization temperature, Tc for gelatin. Thus, we ramped the DSC towards negative celcius to obtain any Tc peak. Unfortunately, we are not getting any peak. Most of gelatin literature only reporting the presence of the glass transition, Tg and melting temperature, Tm. No clear literature mentioned about this matter. Up to now, we only got the information that protein that bound water does not freezing down to -60 C to -70 C. Hope to get further clarification and explanation regarding the matter. Thank you for your kind response.